gkserver.h

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/*
 * gkserver.h
 *
 * H225 Registration Admission and Security protocol handler
 *
 * Open H323 Library
 *
 * Copyright (c) 1998-2001 Equivalence Pty. Ltd.
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is Open H323 Library.
 *
 * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
 *
 * This code was based on original code from OpenGate of Egoboo Ltd. thanks
 * to Ashley Unitt for his efforts.
 *
 * Contributor(s): ______________________________________.
 *
 * $Log: gkserver.h,v $
 * Revision 2.17  2007/06/29 06:59:56  rjongbloed
 * Major improvement to the "product info", normalising H.221 and User-Agent mechanisms.
 *
 * Revision 2.16  2006/08/21 04:52:40  csoutheren
 * Fixed spelling error in documentation
 *
 * Revision 2.15  2006/04/25 07:48:07  rjongbloed
 * Ported changes from OpenH323 gatekeeper server to OPAL code base.
 *
 * Revision 2.14  2006/01/02 15:51:44  dsandras
 * Merged changes from OpenH323 Atlas_devel_2.
 *
 * Revision 2.13  2005/11/30 13:35:26  csoutheren
 * Changed tags for Doxygen
 *
 * Revision 2.12  2004/06/04 06:54:02  csoutheren
 * Migrated updates from OpenH323 1.14.1
 *
 * Revision 2.11  2004/04/25 02:53:29  rjongbloed
 * Fixed GNU 3.4 warnings
 *
 * Revision 2.10  2004/02/19 10:46:43  rjongbloed
 * Merged OpenH323 version 1.13.1 changes.
 *
 * Revision 2.9  2003/01/07 04:39:52  robertj
 * Updated to OpenH323 v1.11.2
 *
 * Revision 2.8  2002/11/10 11:33:16  robertj
 * Updated to OpenH323 v1.10.3
 *
 * Revision 2.7  2002/09/16 02:52:33  robertj
 * Added #define so can select if #pragma interface/implementation is used on
 *   platform basis (eg MacOS) rather than compiler, thanks Robert Monaghan.
 *
 * Revision 2.6  2002/09/04 06:01:46  robertj
 * Updated to OpenH323 v1.9.6
 *
 * Revision 2.5  2002/07/01 04:56:29  robertj
 * Updated to OpenH323 v1.9.1
 *
 * Revision 2.4  2002/03/22 06:57:48  robertj
 * Updated to OpenH323 version 1.8.2
 *
 * Revision 2.3  2002/02/11 09:32:11  robertj
 * Updated to openH323 v1.8.0
 *
 * Revision 2.2  2002/01/14 06:35:56  robertj
 * Updated to OpenH323 v1.7.9
 *
 * Revision 2.1  2001/08/13 05:10:39  robertj
 * Updates from OpenH323 v1.6.0 release.
 *
 * Revision 2.0  2001/07/27 15:48:24  robertj
 * Conversion of OpenH323 to Open Phone Abstraction Library (OPAL)
 *
 * Revision 1.87  2005/11/30 13:05:01  csoutheren
 * Changed tags for Doxygen
 *
 * Revision 1.86  2005/01/03 14:03:19  csoutheren
 * Added new configure options and ability to disable/enable modules
 *
 * Revision 1.85  2005/01/03 06:25:52  csoutheren
 * Added extensive support for disabling code modules at compile time
 *
 * Revision 1.84  2004/12/14 06:22:20  csoutheren
 * More OSP implementation
 *
 * Revision 1.83  2004/09/03 01:06:08  csoutheren
 * Added initial hooks for H.460 GEF
 * Thanks to Simon Horne and ISVO (Asia) Pte Ltd. for this contribution
 *
 * Revision 1.82  2004/08/03 07:00:13  csoutheren
 * Added isGKRouted hint to TranslateAliasAddress as this is needed for the reply ACF
 *
 * Revision 1.81  2004/06/15 03:30:45  csoutheren
 * Adde guard to function to prevent crash if no aliases on an endpoint
 *
 * Revision 1.80  2004/06/04 07:05:07  csoutheren
 * Fixed obvious typos
 *
 * Revision 1.79  2004/04/25 01:52:46  rjongbloed
 * Fixed GCC 3.4 warnings
 *
 * Revision 1.78  2004/04/21 01:39:05  csoutheren
 * Added new overrides to GatekeeperServer to provide virtuals when calls and endpoints are created and destroyed
 *
 * Revision 1.77  2004/04/15 07:43:36  csoutheren
 * Allow gatekeeper to make a decision on multiple alias registrations for each registration
 *
 * Revision 1.76  2004/04/14 01:41:59  csoutheren
 * Added access to endpoint information for GetUserPassword
 *
 * Revision 1.75  2004/03/31 07:16:22  csoutheren
 * Added virtual to provide access to H.501 descriptor sent by GK
 *
 * Revision 1.74  2004/02/15 03:36:30  rjongbloed
 * Fixed bug in removing prefixes, plus added ability to have multiple endpoints
 *   with the same profix, thanks Rossano Ravelli
 *
 * Revision 1.73  2004/02/07 11:43:59  rjongbloed
 * Fixed deadlocks caused under high load by failure to check locking
 *   success. Also added functions to find destination endpoint.
 *   Thanks Federico Pinna and the gang at Reitek S.p.A.
 *
 * Revision 1.72  2003/12/24 07:08:47  csoutheren
 * Added TranslateAliasAddress on H323GatekeeperCall
 *
 * Revision 1.71  2003/12/11 05:39:04  csoutheren
 * Added storage of H.225 version in endpoint structure
 * Disabled sending RIPs to endpoints that cannot handle them
 *
 * Revision 1.70  2003/12/11 02:18:17  csoutheren
 * More fixes for NM deregistration problems. Seems to be fixed now :)
 *
 * Revision 1.69  2003/12/09 00:58:46  csoutheren
 * Fixed problem with endpoints deregistering
 *
 * Revision 1.68  2003/12/09 00:33:17  csoutheren
 * Added patch to prevent crash when NM unregisters from GK
 * Abject apologies to Rossano Ravelli for taking so long to add this
 *
 * Revision 1.67  2003/04/30 00:28:50  robertj
 * Redesigned the alternate credentials in ARQ system as old implementation
 *   was fraught with concurrency issues, most importantly it can cause false
 *   detection of replay attacks taking out an endpoint completely.
 *
 * Revision 1.66  2003/04/02 06:58:10  robertj
 * Added support for (optional) duplicate aliases in gatekeeper server, necessitating
 *   the removal of AddAlias and RemoveAlias functions.
 *
 * Revision 1.65  2003/04/02 06:07:12  robertj
 * Added H.323 Annex G Peer Element support to gatekeeper server.
 *
 * Revision 1.64  2003/04/01 07:30:52  robertj
 * Added function to translate alias into alias list and transport to make
 *   use of full information returned by peer element.
 *
 * Revision 1.63  2003/04/01 04:47:48  robertj
 * Abstracted H.225 RAS transaction processing (RIP and secondary thread) in
 *   server environment for use by H.501 peer elements.
 *
 * Revision 1.62  2003/03/26 07:10:03  robertj
 * Added more access functions.
 *
 * Revision 1.61  2003/03/17 22:52:06  craigs
 * Improvided useability of AddAlias and RemoveAlias
 *
 * Revision 1.60  2003/03/04 05:34:13  robertj
 * Fixed GNU warnings
 *
 * Revision 1.59  2003/03/04 05:27:51  robertj
 * Added statistics for rejected registrations and call admissions.
 *
 * Revision 1.58  2003/03/03 06:59:26  robertj
 * Fixed call SetBandwidth function so adjusts global bandwidth as well.
 *
 * Revision 1.57  2003/02/21 07:21:40  robertj
 * Fixed incorrect ancestor in PCLASSINFO()
 *
 * Revision 1.56  2003/02/21 05:28:39  craigs
 * Factored out code for user with peer elements
 *
 * Revision 1.55  2003/02/06 04:43:14  robertj
 * Changes to help with endpoints behind NAT.
 *
 * Revision 1.54  2003/02/03 03:58:06  robertj
 * Fixed use of local password database with ep's that have multiple aliases.
 *
 * Revision 1.53  2003/02/01 13:31:14  robertj
 * Changes to support CAT authentication in RAS.
 *
 * Revision 1.52  2002/12/17 01:25:23  robertj
 * Added call backs on gk server when ep indicates alerting or connect.
 *
 * Revision 1.51  2002/11/28 05:45:46  robertj
 * Fixed bug so can set total bandwidth while calls are in progress.
 *
 * Revision 1.50  2002/11/28 04:41:44  robertj
 * Added support for RAS ServiceControlIndication command.
 *
 * Revision 1.49  2002/11/27 06:54:52  robertj
 * Added Service Control Session management as per Annex K/H.323 via RAS
 *   only at this stage.
 * Added H.248 ASN and very primitive infrastructure for linking into the
 *   Service Control Session management system.
 * Added basic infrastructure for Annex K/H.323 HTTP transport system.
 * Added Call Credit Service Control to display account balances.
 *
 * Revision 1.48  2002/11/22 00:11:29  robertj
 * Added call start time.
 *
 * Revision 1.47  2002/11/18 23:40:45  robertj
 * Changed to use the H323EndPoint::CreateAuthenticators() function, we
 *   should use only one.
 *
 * Revision 1.46  2002/11/12 11:36:03  robertj
 * Added function to find endpoint by partial alias.
 * Optimised endpoint "indexes" to use sorted lists instead of dictionaries.
 *
 * Revision 1.45  2002/11/06 23:23:48  robertj
 * Fixed minor error in parameter, should be reference not value
 *
 * Revision 1.44  2002/10/29 00:12:02  robertj
 * Changed template classes so things like PSafeList actually creates the
 *   base collection class as well.
 * Improved setting of usage info, included getting it from BRQ etc.
 *
 * Revision 1.43  2002/10/21 00:54:47  robertj
 * Added function to unregister an endpoint via user interface.
 * Added reason code to call disengage.
 * Added ability to find call by a description string.
 *
 * Revision 1.42  2002/10/17 05:26:33  robertj
 * Added function to get at registered endpoints protocol version.
 *
 * Revision 1.41  2002/10/16 07:22:50  robertj
 * Added support for endpoints that do not support RRQ timeToLive parameter,
 *   will actively go see if ep is there using IRQ before expiring the ep.
 *
 * Revision 1.40  2002/10/01 08:17:34  robertj
 * Fixed (benign) race condition between client and server both wanting to do
 *   a DRQ of a call at the same time. Caused an Assert, but no crash.
 *
 * Revision 1.39  2002/09/26 01:27:31  robertj
 * Changed appliation info name in registered endpoint to be caseless string.
 *
 * Revision 1.38  2002/09/24 08:03:51  robertj
 * Added H.225 RAS protocol version number to registered endpoint structure.
 *
 * Revision 1.37  2002/09/19 09:15:56  robertj
 * Fixed problem with making (and assuring with multi-threading) IRQ and DRQ
 *   requests are sent to the correct endpoint address, thanks Martijn Roest.
 *
 * Revision 1.36  2002/09/16 01:14:15  robertj
 * Added #define so can select if #pragma interface/implementation is used on
 *   platform basis (eg MacOS) rather than compiler, thanks Robert Monaghan.
 *
 * Revision 1.35  2002/09/03 06:19:36  robertj
 * Normalised the multi-include header prevention ifdef/define symbol.
 *
 * Revision 1.34  2002/08/29 07:57:08  robertj
 * Added some statistics to gatekeeper server.
 *
 * Revision 1.33  2002/08/29 06:54:52  robertj
 * Removed redundent thread member variable from request info.
 *
 * Revision 1.32  2002/08/12 08:12:45  robertj
 * Added extra hint to help with ARQ using separate credentials from RRQ.
 *
 * Revision 1.31  2002/08/12 05:38:20  robertj
 * Changes to the RAS subsystem to support ability to make requests to client
 *   from gkserver without causing bottlenecks and race conditions.
 *
 * Revision 1.30  2002/08/05 10:03:47  robertj
 * Cosmetic changes to normalise the usage of pragma interface/implementation.
 *
 * Revision 1.29  2002/08/05 05:17:37  robertj
 * Fairly major modifications to support different authentication credentials
 *   in ARQ to the logged in ones on RRQ. For both client and server.
 * Various other H.235 authentication bugs and anomalies fixed on the way.
 *
 * Revision 1.28  2002/07/16 13:49:22  robertj
 * Added missing lock when removing call from endpoint.
 *
 * Revision 1.27  2002/07/11 09:33:56  robertj
 * Added access functions to various call statistics member variables.
 *
 * Revision 1.26  2002/07/11 07:01:37  robertj
 * Added Disengage() function to force call drop from gk server.
 * Added InfoRequest() function to force client to send an IRR.
 * Added ability to automatically clear calls if do not get IRR for it.
 *
 * Revision 1.25  2002/06/21 02:52:44  robertj
 * Fixed problem with double checking H.235 hashing, this causes failure as
 *   the authenticator thinks it is a replay attack.
 *
 * Revision 1.24  2002/06/19 05:03:08  robertj
 * Changed gk code to allow for H.235 security on an endpoint by endpoint basis.
 *
 * Revision 1.23  2002/06/12 03:55:21  robertj
 * Added function to add/remove multiple listeners in one go comparing against
 *   what is already running so does not interrupt unchanged listeners.
 *
 * Revision 1.22  2002/05/29 00:03:15  robertj
 * Fixed unsolicited IRR support in gk client and server,
 *   including support for IACK and INAK.
 *
 * Revision 1.21  2002/05/21 06:30:31  robertj
 * Changed GRQ to the same as all the other xRQ request handlers.
 *
 * Revision 1.20  2002/05/17 03:42:08  robertj
 * Fixed problems with H.235 authentication on RAS for server and client.
 *
 * Revision 1.19  2002/05/07 03:18:12  robertj
 * Added application info (name/version etc) into registered endpoint data.
 *
 * Revision 1.18  2002/05/06 00:56:37  robertj
 * Sizeable rewrite of gatekeeper server code to make more bulletproof against
 *   multithreaded operation. Especially when using slow response/RIP feature.
 * Also changed the call indexing to use call id and direction as key.
 *
 * Revision 1.17  2002/04/30 23:19:00  dereks
 * Fix documentation typos.
 *
 * Revision 1.16  2002/03/06 02:01:31  robertj
 * Fixed race condition when starting slow server response thread.
 *
 * Revision 1.15  2002/03/05 00:36:01  craigs
 * Added GetReplyAddress for H323GatekeeperRequest
 *
 * Revision 1.14  2002/03/03 21:34:50  robertj
 * Added gatekeeper monitor thread.
 *
 * Revision 1.13  2002/03/02 05:58:57  robertj
 * Fixed possible bandwidth leak (thanks Francisco Olarte Sanz) and in
 *   the process added OnBandwidth function to H323GatekeeperCall class.
 *
 * Revision 1.12  2002/03/01 04:09:09  robertj
 * Fixed problems with keeping track of calls. Calls are now indexed by call-id
 *   alone and maintain both endpoints of call in its structure. Fixes problem
 *   with calls form an endpoint to itself, and having two objects being tracked
 *   where there is really only one call.
 *
 * Revision 1.11  2002/02/04 05:21:13  robertj
 * Lots of changes to fix multithreaded slow response code (RIP).
 * Fixed problem with having two entries for same call in call list.
 *
 * Revision 1.10  2002/01/31 06:45:44  robertj
 * Added more checking for invalid list processing in calls database.
 *
 * Revision 1.9  2002/01/31 00:16:15  robertj
 * Removed const to allow things to compile!
 *
 * Revision 1.8  2001/12/15 08:08:52  robertj
 * Added alerting, connect and end of call times to be sent to RAS server.
 *
 * Revision 1.7  2001/12/14 06:40:47  robertj
 * Added call end reason codes in DisengageRequest for GK server use.
 *
 * Revision 1.6  2001/12/13 11:08:45  robertj
 * Significant changes to support slow request handling, automatically sending
 *   RIP and spawning thread to handle time consuming operation.
 *
 * Revision 1.5  2001/11/19 06:56:44  robertj
 * Added prefix strings for gateways registered with this gk, thanks Mikael Stolt
 *
 * Revision 1.4  2001/08/10 11:03:49  robertj
 * Major changes to H.235 support in RAS to support server.
 *
 * Revision 1.3  2001/08/06 07:44:52  robertj
 * Fixed problems with building without SSL
 *
 * Revision 1.2  2001/08/06 03:18:35  robertj
 * Fission of h323.h to h323ep.h & h323con.h, h323.h now just includes files.
 * Improved access to H.235 secure RAS functionality.
 * Changes to H.323 secure RAS contexts to help use with gk server.
 *
 * Revision 1.1  2001/07/24 02:30:55  robertj
 * Added gatekeeper RAS protocol server classes.
 *
 */

#ifndef __OPAL_GKSERVER_H
#define __OPAL_GKSERVER_H

#ifdef P_USE_PRAGMA
#pragma interface
#endif


#include <ptlib/safecoll.h>
#include <opal/guid.h>
#include <h323/h225ras.h>
#include <h323/transaddr.h>
#include <h323/h235auth.h>
#include <h323/h323pdu.h>
#include <h323/h323trans.h>


class PASN_Sequence;
class PASN_Choice;

class H225_AliasAddress;
class H225_EndpointIdentifier;
class H225_GatekeeperIdentifier;
class H225_ArrayOf_TransportAddress;
class H225_GatekeeperIdentifier;
class H225_EndpointIdentifier;
class H225_InfoRequestResponse_perCallInfo_subtype;
class H225_RasUsageInformation;

class H323RegisteredEndPoint;
class H323GatekeeperListener;
class H323GatekeeperServer;
class H323RasPDU;
class H323PeerElement;


class H323GatekeeperRequest : public H323Transaction
{
    PCLASSINFO(H323GatekeeperRequest, H323Transaction);
  public:
    H323GatekeeperRequest(
      H323GatekeeperListener & rasChannel,
      const H323RasPDU & pdu
    );

    virtual H323TransactionPDU * CreateRIP(
      unsigned sequenceNumber,
      unsigned delay
    ) const;

    virtual BOOL WritePDU(
      H323TransactionPDU & pdu
    );
    BOOL CheckCryptoTokens();
    BOOL CheckGatekeeperIdentifier();
    BOOL GetRegisteredEndPoint();

    virtual PString GetGatekeeperIdentifier() const = 0;
    virtual unsigned GetGatekeeperRejectTag() const = 0;
    virtual PString GetEndpointIdentifier() const = 0;
    virtual unsigned GetRegisteredEndPointRejectTag() const = 0;
    virtual unsigned GetSecurityRejectTag() const = 0;

    H323GatekeeperListener & GetRasChannel() const { return rasChannel; }

    PSafePtr<H323RegisteredEndPoint> endpoint;

  protected:
    H323GatekeeperListener & rasChannel;
};


class H323GatekeeperGRQ : public H323GatekeeperRequest
{
    PCLASSINFO(H323GatekeeperGRQ, H323GatekeeperRequest);
  public:
    H323GatekeeperGRQ(
      H323GatekeeperListener & listener,
      const H323RasPDU & pdu
    );

#if PTRACING
    virtual const char * GetName() const;
#endif
    virtual PString GetGatekeeperIdentifier() const;
    virtual unsigned GetGatekeeperRejectTag() const;
    virtual PString GetEndpointIdentifier() const;
    virtual unsigned GetRegisteredEndPointRejectTag() const;
    virtual H235Authenticator::ValidationResult ValidatePDU() const;
    virtual unsigned GetSecurityRejectTag() const;
    virtual void SetRejectReason(
      unsigned reasonCode
    );

    H225_GatekeeperRequest & grq;
    H225_GatekeeperConfirm & gcf;
    H225_GatekeeperReject  & grj;

  protected:
    virtual Response OnHandlePDU();
};


class H323GatekeeperRRQ : public H323GatekeeperRequest
{
    PCLASSINFO(H323GatekeeperRRQ, H323GatekeeperRequest);
  public:
    H323GatekeeperRRQ(
      H323GatekeeperListener & listener,
      const H323RasPDU & pdu
    );

#if PTRACING
    virtual const char * GetName() const;
#endif
    virtual PString GetGatekeeperIdentifier() const;
    virtual unsigned GetGatekeeperRejectTag() const;
    virtual PString GetEndpointIdentifier() const;
    virtual unsigned GetRegisteredEndPointRejectTag() const;
    virtual H235Authenticator::ValidationResult ValidatePDU() const;
    virtual unsigned GetSecurityRejectTag() const;
    virtual void SetRejectReason(
      unsigned reasonCode
    );

    H225_RegistrationRequest & rrq;
    H225_RegistrationConfirm & rcf;
    H225_RegistrationReject  & rrj;

  protected:
    virtual Response OnHandlePDU();
};


class H323GatekeeperURQ : public H323GatekeeperRequest
{
    PCLASSINFO(H323GatekeeperURQ, H323GatekeeperRequest);
  public:
    H323GatekeeperURQ(
      H323GatekeeperListener & listener,
      const H323RasPDU & pdu
    );

#if PTRACING
    virtual const char * GetName() const;
#endif
    virtual PString GetGatekeeperIdentifier() const;
    virtual unsigned GetGatekeeperRejectTag() const;
    virtual PString GetEndpointIdentifier() const;
    virtual unsigned GetRegisteredEndPointRejectTag() const;
    virtual H235Authenticator::ValidationResult ValidatePDU() const;
    virtual unsigned GetSecurityRejectTag() const;
    virtual void SetRejectReason(
      unsigned reasonCode
    );

    H225_UnregistrationRequest & urq;
    H225_UnregistrationConfirm & ucf;
    H225_UnregistrationReject  & urj;

  protected:
    virtual Response OnHandlePDU();
};


class H323GatekeeperARQ : public H323GatekeeperRequest
{
    PCLASSINFO(H323GatekeeperARQ, H323GatekeeperRequest);
  public:
    H323GatekeeperARQ(
      H323GatekeeperListener & listener,
      const H323RasPDU & pdu
    );

#if PTRACING
    virtual const char * GetName() const;
#endif
    virtual PString GetGatekeeperIdentifier() const;
    virtual unsigned GetGatekeeperRejectTag() const;
    virtual PString GetEndpointIdentifier() const;
    virtual unsigned GetRegisteredEndPointRejectTag() const;
    virtual H235Authenticator::ValidationResult ValidatePDU() const;
    virtual unsigned GetSecurityRejectTag() const;
    virtual void SetRejectReason(
      unsigned reasonCode
    );

    H225_AdmissionRequest & arq;
    H225_AdmissionConfirm & acf;
    H225_AdmissionReject  & arj;

    PString alternateSecurityID;

  protected:
    virtual Response OnHandlePDU();
};


class H323GatekeeperDRQ : public H323GatekeeperRequest
{
    PCLASSINFO(H323GatekeeperDRQ, H323GatekeeperRequest);
  public:
    H323GatekeeperDRQ(
      H323GatekeeperListener & listener,
      const H323RasPDU & pdu
    );

#if PTRACING
    virtual const char * GetName() const;
#endif
    virtual PString GetGatekeeperIdentifier() const;
    virtual unsigned GetGatekeeperRejectTag() const;
    virtual PString GetEndpointIdentifier() const;
    virtual unsigned GetRegisteredEndPointRejectTag() const;
    virtual H235Authenticator::ValidationResult ValidatePDU() const;
    virtual unsigned GetSecurityRejectTag() const;
    virtual void SetRejectReason(
      unsigned reasonCode
    );

    H225_DisengageRequest & drq;
    H225_DisengageConfirm & dcf;
    H225_DisengageReject  & drj;

  protected:
    virtual Response OnHandlePDU();
};


class H323GatekeeperBRQ : public H323GatekeeperRequest
{
    PCLASSINFO(H323GatekeeperBRQ, H323GatekeeperRequest);
  public:
    H323GatekeeperBRQ(
      H323GatekeeperListener & listener,
      const H323RasPDU & pdu
    );

#if PTRACING
    virtual const char * GetName() const;
#endif
    virtual PString GetGatekeeperIdentifier() const;
    virtual unsigned GetGatekeeperRejectTag() const;
    virtual PString GetEndpointIdentifier() const;
    virtual unsigned GetRegisteredEndPointRejectTag() const;
    virtual H235Authenticator::ValidationResult ValidatePDU() const;
    virtual unsigned GetSecurityRejectTag() const;
    virtual void SetRejectReason(
      unsigned reasonCode
    );

    H225_BandwidthRequest & brq;
    H225_BandwidthConfirm & bcf;
    H225_BandwidthReject  & brj;

  protected:
    virtual Response OnHandlePDU();
};


class H323GatekeeperLRQ : public H323GatekeeperRequest
{
    PCLASSINFO(H323GatekeeperLRQ, H323GatekeeperRequest);
  public:
    H323GatekeeperLRQ(
      H323GatekeeperListener & listener,
      const H323RasPDU & pdu
    );

#if PTRACING
    virtual const char * GetName() const;
#endif
    virtual PString GetGatekeeperIdentifier() const;
    virtual unsigned GetGatekeeperRejectTag() const;
    virtual PString GetEndpointIdentifier() const;
    virtual unsigned GetRegisteredEndPointRejectTag() const;
    virtual H235Authenticator::ValidationResult ValidatePDU() const;
    virtual unsigned GetSecurityRejectTag() const;
    virtual void SetRejectReason(
      unsigned reasonCode
    );

    H225_LocationRequest & lrq;
    H225_LocationConfirm & lcf;
    H225_LocationReject  & lrj;

  protected:
    virtual Response OnHandlePDU();
};


class H323GatekeeperIRR : public H323GatekeeperRequest
{
    PCLASSINFO(H323GatekeeperIRR, H323GatekeeperRequest);
  public:
    H323GatekeeperIRR(
      H323GatekeeperListener & listener,
      const H323RasPDU & pdu
    );

#if PTRACING
    virtual const char * GetName() const;
#endif
    virtual PString GetGatekeeperIdentifier() const;
    virtual unsigned GetGatekeeperRejectTag() const;
    virtual PString GetEndpointIdentifier() const;
    virtual unsigned GetRegisteredEndPointRejectTag() const;
    virtual H235Authenticator::ValidationResult ValidatePDU() const;
    virtual unsigned GetSecurityRejectTag() const;
    virtual void SetRejectReason(
      unsigned reasonCode
    );

    H225_InfoRequestResponse & irr;
    H225_InfoRequestAck      & iack;
    H225_InfoRequestNak      & inak;

  protected:
    virtual Response OnHandlePDU();
};


class H323GatekeeperCall : public PSafeObject
{
    PCLASSINFO(H323GatekeeperCall, PSafeObject);
  public:
    enum Direction {
      AnsweringCall,
      OriginatingCall,
      UnknownDirection
    };

    H323GatekeeperCall(
      H323GatekeeperServer & server,               
      const OpalGloballyUniqueID & callIdentifier, 
      Direction direction                          
    );

    ~H323GatekeeperCall();

    Comparison Compare(
      const PObject & obj  
    ) const;

    void PrintOn(
      ostream & strm    
    ) const;

    virtual H323GatekeeperRequest::Response OnAdmission(
      H323GatekeeperARQ & request
    );

    virtual BOOL Disengage(
      int reason = -1   
    );

    virtual H323GatekeeperRequest::Response OnDisengage(
      H323GatekeeperDRQ & request
    );

    virtual H323GatekeeperRequest::Response OnBandwidth(
      H323GatekeeperBRQ & request
    );

    virtual H323GatekeeperRequest::Response OnInfoResponse(
      H323GatekeeperIRR & request,
      H225_InfoRequestResponse_perCallInfo_subtype & call
    );

    virtual void OnAlerting();

    virtual void OnConnected();

    virtual BOOL OnHeartbeat();

    virtual PString GetCallCreditAmount() const;

    virtual BOOL GetCallCreditMode() const;

    virtual unsigned GetDurationLimit() const;

    virtual BOOL SendCallCreditServiceControl();

    BOOL AddCallCreditServiceControl(
      H225_ArrayOf_ServiceControlSession & serviceControl
    ) const;

    virtual BOOL SendServiceControlSession(
      const H323ServiceControlSession & session
    );

    virtual BOOL TranslateAliasAddress(
      const H225_AliasAddress & alias,
      H225_ArrayOf_AliasAddress & aliases,
      H323TransportAddress & address,
      BOOL & isGkRouted
    );


    H323GatekeeperServer & GetGatekeeper() const { return gatekeeper; }
    H323RegisteredEndPoint & GetEndPoint() const { return *PAssertNULL(endpoint); }
    BOOL IsAnsweringCall() const { return direction == AnsweringCall; }
    unsigned GetCallReference() const { return callReference; }
    const OpalGloballyUniqueID & GetCallIdentifier() const { return callIdentifier; }
    const OpalGloballyUniqueID & GetConferenceIdentifier() const { return conferenceIdentifier; }
    const PString & GetSourceNumber() const { return srcNumber; }
    const PStringArray & GetSourceAliases() const { return srcAliases; }
    const H323TransportAddress & GetSourceHost() const { return srcHost; }
    PString GetSourceAddress() const;
    const PString & GetDestinationNumber() const { return dstNumber; }
    const PStringArray & GetDestinationAliases() const { return dstAliases; }
    const H323TransportAddress & GetDestinationHost() const { return dstHost; }
    PString GetDestinationAddress() const;
    unsigned GetBandwidthUsed() const { return bandwidthUsed; }
    BOOL SetBandwidthUsed(unsigned bandwidth);
    const PTime & GetLastInfoResponseTime() const { return lastInfoResponse; }
    const PTime & GetCallStartTime() const { return callStartTime; }
    const PTime & GetAlertingTime() const { return alertingTime; }
    const PTime & GetConnectedTime() const { return connectedTime; }
    const PTime & GetCallEndTime() const { return callEndTime; }
    H323Connection::CallEndReason GetCallEndReason() const { return callEndReason; }

  protected:
    void SetUsageInfo(const H225_RasUsageInformation & usage);

    H323GatekeeperServer   & gatekeeper;
    H323RegisteredEndPoint * endpoint;
    H323GatekeeperListener * rasChannel;

    Direction            direction;
    unsigned             callReference;
    OpalGloballyUniqueID callIdentifier;
    OpalGloballyUniqueID conferenceIdentifier;
    PString              srcNumber;
    PStringArray         srcAliases;
    H323TransportAddress srcHost;
    PString              dstNumber;
    PStringArray         dstAliases;
    H323TransportAddress dstHost;
    unsigned             bandwidthUsed;
    unsigned             infoResponseRate;
    PTime                lastInfoResponse;

    BOOL                          drqReceived;
    PTime                         callStartTime;
    PTime                         alertingTime;
    PTime                         connectedTime;
    PTime                         callEndTime;
    H323Connection::CallEndReason callEndReason;
};


class H323RegisteredEndPoint : public PSafeObject
{
    PCLASSINFO(H323RegisteredEndPoint, PSafeObject);
  public:
    H323RegisteredEndPoint(
      H323GatekeeperServer & server, 
      const PString & id             
    );

    Comparison Compare(
      const PObject & obj  
    ) const;

    void PrintOn(
      ostream & strm    
    ) const;

    virtual void AddCall(
      H323GatekeeperCall * call
    );

    virtual BOOL RemoveCall(
      H323GatekeeperCall * call
    );

    PINDEX GetCallCount() const { return activeCalls.GetSize(); }

    H323GatekeeperCall & GetCall(
      PINDEX idx
    ) { return activeCalls[idx]; }

    virtual H323GatekeeperRequest::Response OnRegistration(
      H323GatekeeperRRQ & request
    );

    virtual H323GatekeeperRequest::Response OnFullRegistration(
      H323GatekeeperRRQ & request
    );

    virtual H323GatekeeperRequest::Response OnSecureRegistration(
      H323GatekeeperRRQ & request
    );

    virtual H323GatekeeperRequest::Response OnUnregistration(
      H323GatekeeperURQ & request
    );

    virtual BOOL Unregister(
      int reason = -1   
    );

    virtual H323GatekeeperRequest::Response OnInfoResponse(
      H323GatekeeperIRR & request
    );

    virtual BOOL OnTimeToLive();

    virtual PString GetCallCreditAmount() const;

    virtual BOOL GetCallCreditMode() const;

    virtual BOOL SendServiceControlSession(
      const H323ServiceControlSession & session
    );

    virtual BOOL AddServiceControlSession(
      const H323ServiceControlSession & session,
      H225_ArrayOf_ServiceControlSession & serviceControl
    );

    virtual BOOL SetPassword(
      const PString & password,
      const PString & username = PString::Empty()
    );

    const PString & GetIdentifier() const { return identifier; }

    const OpalGloballyUniqueID & GetDescriptorID() const { return descriptorID; }

    H323GatekeeperServer & GetGatekeeper() const { return gatekeeper; }

    const H323TransportAddressArray & GetRASAddresses() const { return rasAddresses; }

    PINDEX GetRASAddressCount() const { return rasAddresses.GetSize(); }

    H323TransportAddress GetRASAddress(
      PINDEX idx
    ) const { return rasAddresses[idx]; }

    const H323TransportAddressArray & GetSignalAddresses() const { return signalAddresses; }

    PINDEX GetSignalAddressCount() const { return signalAddresses.GetSize(); }

    H323TransportAddress GetSignalAddress(
      PINDEX idx
    ) const { return signalAddresses[idx]; }

    const PStringArray & GetAliases() const { return aliases; }

    BOOL ContainsAlias(
      const PString & alias
      ) { return aliases.GetStringsIndex(alias) != P_MAX_INDEX; }

    PINDEX GetAliasCount() const { return aliases.GetSize(); }

    PString GetAlias(
      PINDEX idx
    ) const { if (idx < aliases.GetSize()) return aliases[idx]; return PString::Empty(); }

    void RemoveAlias(
      const PString & alias
    );

    virtual const H235Authenticators & GetAuthenticators() const { return authenticators; }

    PINDEX GetPrefixCount() const { return voicePrefixes.GetSize(); }

    PString GetPrefix(
      PINDEX idx
    ) const { return voicePrefixes[idx]; }

    PCaselessString GetApplicationInfo() const { return productInfo.AsString(); }

    const OpalProductInfo & GetProductInfo() const { return productInfo; }

    unsigned GetProtocolVersion() const { return protocolVersion; }

    BOOL IsBehindNAT() const { return isBehindNAT; }

    BOOL CanDisplayAmountString() const { return canDisplayAmountString; }

    BOOL CanEnforceDurationLimit() const { return canEnforceDurationLimit; }

    BOOL CanReceiveRIP() const;

    BOOL GetH225Version() const { return h225Version; }

      virtual BOOL OnSendDescriptorForEndpoint(
        H225_ArrayOf_AliasAddress & aliases,          
        H225_EndpointType & terminalType,             
        H225_ArrayOf_AliasAddress & transportAddresses  
      );


  protected:
    H323GatekeeperServer    & gatekeeper;
    H323GatekeeperListener  * rasChannel;

    PString                   identifier;
    OpalGloballyUniqueID      descriptorID;
    H323TransportAddressArray rasAddresses;
    H323TransportAddressArray signalAddresses;
    PStringArray              aliases;
    PStringArray              voicePrefixes;
    OpalProductInfo           productInfo;
    unsigned                  protocolVersion;
    BOOL                      isBehindNAT;
    BOOL                      canDisplayAmountString;
    BOOL                      canEnforceDurationLimit;
    unsigned                  h225Version;
    unsigned                  timeToLive;
    H235Authenticators        authenticators;

    PTime lastRegistration;
    PTime lastInfoResponse;

    PSortedList<H323GatekeeperCall> activeCalls;
    POrdinalDictionary<PString>     serviceControlSessions;
};


class H323GatekeeperListener : public H225_RAS
{
    PCLASSINFO(H323GatekeeperListener, H225_RAS);
  public:
    H323GatekeeperListener(
      H323EndPoint & endpoint,               
      H323GatekeeperServer & server,         
      const PString & gatekeeperIdentifier,  
      H323Transport * transport = NULL       
    );

    ~H323GatekeeperListener();

    BOOL UnregistrationRequest(
      const H323RegisteredEndPoint & ep,
      unsigned reason
    );

    BOOL DisengageRequest(
      const H323GatekeeperCall & call,
      unsigned reason
    );

    virtual BOOL InfoRequest(
      H323RegisteredEndPoint & ep,
      H323GatekeeperCall * call = NULL
    );

    virtual BOOL ServiceControlIndication(
      H323RegisteredEndPoint & ep,
      const H323ServiceControlSession & session,
      H323GatekeeperCall * call = NULL
    );

    virtual H323GatekeeperRequest::Response OnDiscovery(
      H323GatekeeperGRQ & request
    );

    virtual H323GatekeeperRequest::Response OnRegistration(
      H323GatekeeperRRQ & request
    );

    virtual H323GatekeeperRequest::Response OnUnregistration(
      H323GatekeeperURQ & request
    );

    virtual H323GatekeeperRequest::Response OnAdmission(
      H323GatekeeperARQ & request
    );

    virtual H323GatekeeperRequest::Response OnDisengage(
      H323GatekeeperDRQ & request
    );

    virtual H323GatekeeperRequest::Response OnBandwidth(
      H323GatekeeperBRQ & request
    );

    virtual H323GatekeeperRequest::Response OnLocation(
      H323GatekeeperLRQ & request
    );

    virtual H323GatekeeperRequest::Response OnInfoResponse(
      H323GatekeeperIRR & request
    );

    virtual BOOL OnReceiveGatekeeperRequest(const H323RasPDU &, const H225_GatekeeperRequest &);
    virtual BOOL OnReceiveRegistrationRequest(const H323RasPDU &, const H225_RegistrationRequest &);
    virtual BOOL OnReceiveUnregistrationRequest(const H323RasPDU &, const H225_UnregistrationRequest &);
    virtual BOOL OnReceiveUnregistrationConfirm(const H225_UnregistrationConfirm &);
    virtual BOOL OnReceiveUnregistrationReject(const H225_UnregistrationReject &);
    virtual BOOL OnReceiveAdmissionRequest(const H323RasPDU &, const H225_AdmissionRequest &);
    virtual BOOL OnReceiveBandwidthRequest(const H323RasPDU &, const H225_BandwidthRequest &);
    virtual BOOL OnReceiveBandwidthConfirm(const H225_BandwidthConfirm &);
    virtual BOOL OnReceiveBandwidthReject(const H225_BandwidthReject &);
    virtual BOOL OnReceiveDisengageRequest(const H323RasPDU &, const H225_DisengageRequest &);
    virtual BOOL OnReceiveDisengageConfirm(const H225_DisengageConfirm &);
    virtual BOOL OnReceiveDisengageReject(const H225_DisengageReject &);
    virtual BOOL OnReceiveLocationRequest(const H323RasPDU &, const H225_LocationRequest &);
    virtual BOOL OnReceiveInfoRequestResponse(const H323RasPDU &, const H225_InfoRequestResponse &);
    virtual BOOL OnReceiveResourcesAvailableConfirm(const H225_ResourcesAvailableConfirm &);
    virtual BOOL OnSendFeatureSet(unsigned, H225_FeatureSet & features) const;
    virtual void OnReceiveFeatureSet(unsigned, const H225_FeatureSet & features) const;

    H323GatekeeperServer & GetGatekeeper() const { return gatekeeper; }


  protected:
    H323GatekeeperServer & gatekeeper;
};


class H323GatekeeperServer : public H323TransactionServer
{
    PCLASSINFO(H323GatekeeperServer, H323TransactionServer);
  public:
    H323GatekeeperServer(
      H323EndPoint & endpoint
    );

    ~H323GatekeeperServer();

    WORD GetDefaultUdpPort() { return H225_RAS::DefaultRasUdpPort; }

    virtual H323Transactor * CreateListener(
      H323Transport * transport  
    );


    virtual H323GatekeeperRequest::Response OnDiscovery(
      H323GatekeeperGRQ & request
    );

    virtual H323GatekeeperRequest::Response OnRegistration(
      H323GatekeeperRRQ & request
    );

    virtual H323GatekeeperRequest::Response OnUnregistration(
      H323GatekeeperURQ & request
    );

    virtual H323GatekeeperRequest::Response OnInfoResponse(
      H323GatekeeperIRR & request
    );

    virtual void AddEndPoint(
      H323RegisteredEndPoint * ep
    );

    virtual BOOL RemoveEndPoint(
      H323RegisteredEndPoint * ep
    );

    virtual H323RegisteredEndPoint * CreateRegisteredEndPoint(
      H323GatekeeperRRQ & request
    );

    virtual PString CreateEndPointIdentifier();

    virtual PSafePtr<H323RegisteredEndPoint> FindEndPointByIdentifier(
      const PString & identifier,
      PSafetyMode mode = PSafeReference
    );

    virtual PSafePtr<H323RegisteredEndPoint> FindEndPointBySignalAddresses(
      const H225_ArrayOf_TransportAddress & addresses,
      PSafetyMode mode = PSafeReference
    );

    virtual PSafePtr<H323RegisteredEndPoint> FindEndPointBySignalAddress(
      const H323TransportAddress & address,
      PSafetyMode mode = PSafeReference
    );

    virtual PSafePtr<H323RegisteredEndPoint> FindEndPointByAliasAddress(
      const H225_AliasAddress & alias,
      PSafetyMode mode = PSafeReadWrite
    );

    virtual PSafePtr<H323RegisteredEndPoint> FindEndPointByAliasString(
      const PString & alias,
      PSafetyMode mode = PSafeReference
    );

    virtual PSafePtr<H323RegisteredEndPoint> FindEndPointByPartialAlias(
      const PString & alias,
      PSafetyMode mode = PSafeReference
    );

    virtual PSafePtr<H323RegisteredEndPoint> FindEndPointByPrefixString(
      const PString & prefix,
      PSafetyMode mode = PSafeReference
    );

    PSafePtr<H323RegisteredEndPoint> GetFirstEndPoint(
      PSafetyMode mode = PSafeReference
    ) { return PSafePtr<H323RegisteredEndPoint>(byIdentifier, mode); }

    PSafePtr<H323RegisteredEndPoint> FindDestinationEndPoint(
      const OpalGloballyUniqueID & id, 
      H323GatekeeperCall::Direction direction
    );
    
    virtual H323GatekeeperRequest::Response OnAdmission(
      H323GatekeeperARQ & request
    );

    virtual H323GatekeeperRequest::Response OnDisengage(
      H323GatekeeperDRQ & request
    );

    virtual H323GatekeeperRequest::Response OnBandwidth(
      H323GatekeeperBRQ & request
    );

    virtual H323GatekeeperCall * CreateCall(
      const OpalGloballyUniqueID & callIdentifier,
      H323GatekeeperCall::Direction direction
    );

    virtual void AddCall(H323GatekeeperCall *) 
    { }

    virtual void RemoveCall(
      H323GatekeeperCall * call
    );

    virtual PSafePtr<H323GatekeeperCall> FindCall(
      const PString & description,
      PSafetyMode mode = PSafeReference
    );

    virtual PSafePtr<H323GatekeeperCall> FindCall(
      const OpalGloballyUniqueID & callIdentifier,
      BOOL answeringCall,
      PSafetyMode mode = PSafeReference
    );

    virtual PSafePtr<H323GatekeeperCall> FindCall(
      const OpalGloballyUniqueID & callIdentifier,
      H323GatekeeperCall::Direction direction,
      PSafetyMode mode = PSafeReference
    );

    PSafePtr<H323GatekeeperCall> GetFirstCall(
      PSafetyMode mode = PSafeReference
    ) { return PSafePtr<H323GatekeeperCall>(activeCalls, mode); }

    virtual H323GatekeeperRequest::Response OnLocation(
      H323GatekeeperLRQ & request
    );

    virtual BOOL TranslateAliasAddress(
      const H225_AliasAddress & alias,
      H225_ArrayOf_AliasAddress & aliases,
      H323TransportAddress & address,
      BOOL & isGkRouted,
      H323GatekeeperCall * call
    );

    virtual BOOL TranslateAliasAddressToSignalAddress(
      const H225_AliasAddress & alias,
      H323TransportAddress & address
    );

    virtual BOOL CheckSignalAddressPolicy(
      const H323RegisteredEndPoint & ep,
      const H225_AdmissionRequest & arq,
      const H323TransportAddress & address
    );

    virtual BOOL CheckAliasAddressPolicy(
      const H323RegisteredEndPoint & ep,
      const H225_AdmissionRequest & arq,
      const H225_AliasAddress & alias
    );

    virtual BOOL CheckAliasStringPolicy(
      const H323RegisteredEndPoint & ep,
      const H225_AdmissionRequest & arq,
      const PString & alias
    );

    virtual unsigned AllocateBandwidth(
      unsigned newBandwidth,
      unsigned oldBandwidth = 0
    );

    virtual BOOL GetAdmissionRequestAuthentication(
      H323GatekeeperARQ & info,           
      H235Authenticators & authenticators 
    );

    virtual BOOL GetUsersPassword(
      const PString & alias,
      PString & password,
      H323RegisteredEndPoint & registeredEndpoint
    ) const;
    virtual BOOL GetUsersPassword(
      const PString & alias,
      PString & password
    ) const;

    H323PeerElement * GetPeerElement() const { return peerElement; }

    void SetPeerElement(
      H323PeerElement * newPeerElement
    );

    void CreatePeerElement(
      const H323TransportAddress & h501Interface
    );

    BOOL OpenPeerElement(
      const H323TransportAddress & remotePeer,
      BOOL append = FALSE,
      BOOL keepTrying = TRUE
    );

    const PString & GetGatekeeperIdentifier() const { return gatekeeperIdentifier; }

    void SetGatekeeperIdentifier(
      const PString & id,
      BOOL adjustListeners = TRUE
    );

    unsigned GetAvailableBandwidth() const { return totalBandwidth; }

    void SetAvailableBandwidth(unsigned bps100) { totalBandwidth = bps100; }

    unsigned GetUsedBandwidth() const { return usedBandwidth; }

    unsigned GetDefaultBandwidth() const { return defaultBandwidth; }

    unsigned GetTimeToLive() const { return defaultTimeToLive; }

    void SetTimeToLive(unsigned seconds) { defaultTimeToLive = seconds; }

    unsigned GetInfoResponseRate() const { return defaultInfoResponseRate; }

    void SetInfoResponseRate(unsigned seconds) { defaultInfoResponseRate = seconds; }

    BOOL IsGatekeeperRouted() const { return isGatekeeperRouted; }

    BOOL IsRequiredH235() const { return requireH235; }

    unsigned GetActiveRegistrations() const { return byIdentifier.GetSize(); }

    unsigned GetPeakRegistrations() const { return peakRegistrations; }

    unsigned GetTotalRegistrations() const { return totalRegistrations; }

    unsigned GetRejectedRegistrations() const { return rejectedRegistrations; }

    unsigned GetActiveCalls() const { return activeCalls.GetSize(); }

    unsigned GetPeakCalls() const { return peakCalls; }

    unsigned GetTotalCalls() const { return totalCalls; }

    unsigned GetRejectedCalls() const { return rejectedCalls; }

    // Remove an alias from the server database.
    void RemoveAlias(
      H323RegisteredEndPoint & ep,
      const PString & alias
    );

    // called when an endpoint needs to send a descriptor to the H.501 peer element
    virtual BOOL OnSendDescriptorForEndpoint(
      H323RegisteredEndPoint & /*ep*/,                    
      H225_ArrayOf_AliasAddress & /*aliases*/,            
      H225_EndpointType & /*terminalType*/,               
      H225_ArrayOf_AliasAddress & /*transportAddresses*/  
    )
    { return TRUE; } 

    virtual BOOL AllowDuplicateAlias(const H225_ArrayOf_AliasAddress & /*aliases*/)
    { return canHaveDuplicateAlias; }

    virtual BOOL OnSendFeatureSet(unsigned, H225_FeatureSet & features) const;
    virtual void OnReceiveFeatureSet(unsigned, const H225_FeatureSet & features) const;

  protected:

    PDECLARE_NOTIFIER(PThread, H323GatekeeperServer, MonitorMain);

    // Configuration & policy variables
    PString  gatekeeperIdentifier;
    unsigned totalBandwidth;
    unsigned usedBandwidth;
    unsigned defaultBandwidth;
    unsigned maximumBandwidth;
    unsigned defaultTimeToLive;
    unsigned defaultInfoResponseRate;
    BOOL     overwriteOnSameSignalAddress;
    BOOL     canHaveDuplicateAlias;
    BOOL     canHaveDuplicatePrefix;
    BOOL     canOnlyCallRegisteredEP;
    BOOL     canOnlyAnswerRegisteredEP;
    BOOL     answerCallPreGrantedARQ;
    BOOL     makeCallPreGrantedARQ;
    BOOL     isGatekeeperRouted;
    BOOL     aliasCanBeHostName;
    BOOL     requireH235;
    BOOL     disengageOnHearbeatFail;

    PStringToString passwords;

    // Dynamic variables
    PMutex         mutex;
    time_t         identifierBase;
    unsigned       nextIdentifier;
    PThread      * monitorThread;
    PSyncPoint     monitorExit;

    PLIST(ListenerList, H323GatekeeperListener);
    ListenerList listeners;

    H323PeerElement * peerElement;

    PSafeDictionary<PString, H323RegisteredEndPoint> byIdentifier;

    class StringMap : public PString {
        PCLASSINFO(StringMap, PString);
      public:
        StringMap(const PString & from, const PString & id)
          : PString(from), identifier(id) { }
        PString identifier;
    };
    PSortedStringList byAddress;
    PSortedStringList byAlias;
    PSortedStringList byVoicePrefix;

    PSafeSortedList<H323GatekeeperCall> activeCalls;

    PINDEX peakRegistrations;
    PINDEX totalRegistrations;
    PINDEX rejectedRegistrations;
    PINDEX peakCalls;
    PINDEX totalCalls;
    PINDEX rejectedCalls;

  friend class H323GatekeeperRRQ;
  friend class H323GatekeeperARQ;
};


#endif // __OPAL_GKSERVER_H

---