4.16. Enabling and Disabling Tunneling in H.323

Tunneling is the encapsulation of H.245 media control messages within Q.931/H.225 signaling messages. If tunneling is enabled, one less TCP port is required for incoming connections.

For outgoing calls, the application can enable or disable tunneling by including the following parameter set ID and parameter ID in the GCLIB_MAKECALL_BLK used by the gc_MakeCall( ) function:

• IPSET_CALLINFO
  • IPPARM_H245TUNNELING - Possible values are:
    • IP_H245TUNNELING_ON
    • IP_H245TUNNELING_OFF

For incoming calls, tunneling is enabled by default, but it can be configured on a board device level (where a board device is a virtual entity that corresponds to a NIC or NIC address; see Section 2.2.1, IPT Board Devices). This is done using the gc_SetConfigData( ) function with target ID of the board device and the parameters above specified in the GC_PARM_BLKP structure associated with the gc_SetConfigData( ) function.

Note: Tunneling for inbound calls can be configured on a board device basis only (using the gc_SetConfigData( ) function). Tunneling for inbound calls cannot be configured on a per line device or per call basis (using the gc_SetUserInfo( ) function).

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