3com SuperStack 3 NBX Manual De Usuario

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A
PPENDIX
 D: C
ONNE
X
TIONS
 H.323 G
ATEWAY
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
Book
IP Telephony: Packet-Based Multimedia Communications Systems — 
Olivier Hersent, David Gurle, Jean-Pierre Petit (1999).