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426 APPENDIX D: CONNEXTIONS H.323 GATEWAY
Handling
Conference Calls
You can include gateway port connections in local conference calls along
with PSTN line connections. However, ConneXtions does not support
conferences at the H.323 level, so, if two or more of the conferring
parties are at a remote NBX system, each requires a separate port
connection. This characteristic determines who can initiate the
conference call.
A four-way conference call with three people at one NBX site and one
person at the other site uses one H.323 port if it is set up from the side
with three people. Otherwise, it needs three ports.
Related H.323
Documentation
Here are some useful sources of information on the H.323 standard:
Web Sites
■ http://www.packetizer.com/iptel/h323/
■ http://www.itu.int/itudoc/itu-t/rec/h/
Book
IP Telephony: Packet-Based Multimedia Communications Systems —
Olivier Hersent, David Gurle, Jean-Pierre Petit (1999).