TISPAN; PSTN/ISDN simulation services: Conference (CONF); Protocol specification
The present document specifies the, stage three, Protocol Description of the Conference (CONF) service based on stage one and two of the ISDN CONF supplementary service. Within the Next Generation Network (NGN) the stage 3 is specified using the IP-Multimedia Call Control Protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP).
The present document specifies centralized conferencing, using a conference focus, distributed conferencing is out of scope.
The present document does not cover the cases of:
a) cascading conference services; and
b) the support of the PSTN/ISDN conference service hosted in the PSTN.