
 Configuration of OpenH323 Channel driver
------------------------------------------

 This section describes the configurable parameters
 of the openh323 channel driver, through its configuration
 file (usually /etc/asterisk/oh323.conf).

 There are three categories: (1) "general", with generic
 configuration information (address, ports, gatekeeper, ...),
 (2) "register", with alias/prefixes and related ASTERISK's
 contexts, (3) "codecs", with configuration information
 about supported codecs.


 Parameters in "general" section:
----------------------------------
 
 "listenAddress" - Address to bind to for incoming H.323
                   connections. Default value is "0.0.0.0"

 "listenPort" - This is the TCP port the H.323 listener
                will listen on. The default value is 1720.

 "connectPort" - This is the TCP port the H.323 will
                 connect to. The default value is 1720.

 "tcpStart"
 "tcpEnd" - The TCP port range to be used by OpenH323.

 "udpStart"
 "udpEnd" - The UDP port range to be used by OpenH323.
            This range doesn't include the RTP port range,
			which can be configured in "rtp.conf" file.

 "fastStart" - Disable/Enable fast start operation.

 "h245Tunnelling" - Disable/Enable H.245 tunnelling.

 "h245inSetup" - Disable/Enable early H.245 messages 
                 in call SETUP message.

 "inBandDTMF" - Disable/Enable in-band DTMF detection.

 "silenceSuppression" - Disable/Enable silence detection
                        for software codecs GSM and G.711

 "jitterMin"
 "jitterMax" - Set jitter buffer min and max values. 
               The value is in milliseconds
               in the range 20...10000ms

 "ipTos" - IP Type-of-Service byte for RTP channels.
           Valid values for this option are:
              lowdelay
              throughput
              reliability
              mincost
              none

 "outboundMax"
 "inboundMax" - Set the maximum number of 
                inbound/outbound H.323 connections.

 "wrapTraceLevel"
 "libTraceLevel"
 "libTraceFile" - Trace options for the H.323 wrapper library.
                  These options provide access to the tracing capabilities
                  of the OpenH323 library. "libTraceFile" can be 'stdout'
                  or a full path name to a file. "wrapTraceLevel" and 
				  "libTraceLevel" can be set to 0 to disable tracing.

 "gatekeeper" - Gatekeeper option. Valid values for this option are:
                   DISABLE  -  disable gatekeeper,
                   DISCOVER -  enable gatekeeper discovery 
                               (through UDP broadcasts)
                   <hostname> or <ip>  -  explicitly specify a gatekeeper
                                          with its hostname or IP,
                   GKID:<gatekeeper's id> - explicitly specify a gatekeeper
                                            with its ID.
 "gatekeeperPassword" - The password to use for gatekeeper authentication.

 "userInputMode" - Specify the mode for sending user-input (DTMF). 
                   Valid values are:
                   Q931        -   Q.931 Keypad Information Element
                   STRING      -   H.245 string
                   TONE        -   H.245 tone
                   RFC2833     -   RFC2833

 "amaFlags" - 

 "accountCode" - 

 "context" - This is the default context in "extensions.conf" file
             where all the incoming H.323 calls without a context, 
             are routed to.


 Parameters in "register" section:
-----------------------------------

 "context" - This is the context in "extensions.conf" file where all the
             incoming H.323 calls, with a calling party number that matches
             any of the alias(es)/prefix(es) following this option, are routed.
             Actually, a "context" option, groups together a set of
             "alias" and/or "gwprefix" options (see below).

 "alias" - Specify H.323 alias(es) for ASTERISK PBX. This parameter
           can be used multiple times. If this parameter contains
           only numbers, then this alias will be registered to the
           gatekeeper as a E.164 number otherwise will be registered
           as a H323ID. Incoming calls with a calling party number 
           matching this alias, are routed into the context specified
           in the preceding "context" option.

 "gwprefix" - Specify H.323 gateway prefix(es) for ASTERISK PBX.
              This parameter can be used multiple times. Incoming 
              calls with a calling party number matching this prefix,
              are routed into the context specified in the preceding
              "context" option.

 Multiple groups of context, alias(es) and gwprefix(es) may be
 defined in this section.


 Parameters in "codecs" section:
---------------------------------

 "codec" - Specify a codec to be used by the H.323 channel driver.
           Valid values are:
              G711U       -   G.711 u-Law
              G711A       -   G.711 A-Law
              G7231       -   G.723.1(6.3k)
              G72316K3    -   G.723.1(6.3k)
              G72315K3    -   G.723.1(5.3k)
              G7231A6K3   -   G.723.1A(6.3k)
              G7231A6K3   -   G.723.1A(6.3k)
              G728        -   G.728
              G729        -   G.729
              G729A       -   G.729A
              G729B       -   G.729B
              G729AB      -   G.729AB
              GSM0610     -   GSM 0610
              MSGSM       -   Microsoft GSM Audio Capability
              LPC10       -   LPC-10
		   Currently, only G711U, G711A, G7231, G729, GSM0610
		   can be used.
 
 "frames" - This option may follow a "codec" option, specifying
            the number of encoded frames in RTP packets for this
            codec.

 Dial string of OH323 channels
------------------------------

 <TO BE ADDED>


