A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Audio/Video Transport Working Group of the IETF.
Title : RTP Control Protocol (RTCP) Port for Multicast Sessions
Author(s) : A. Begen
Filename : draft-ietf-avt-rtcp-port-for-ssm-00.txt
Pages : 7
Date : 2010-06-16
The Session Description Protocol (SDP) has an attribute that allows
RTP applications to specify an address and a port associated with the
RTP Control Protocol (RTCP) traffic. In RTP-based source-specific
multicast (SSM) sessions, the same attribute is used to designate the
address and the RTCP port of the Feedback Target in the SDP
description. However, the RTCP port associated with the SSM session
itself cannot be specified by the same attribute to avoid ambiguity,
and thus, is required to be derived from the "m=" line of the media
description. Similarly, in any-source multicast (ASM) sessions,
there is no explicit way to specify the destination RTCP port.
Deriving the RTCP port from the "m=" line imposes an unnecessary
restriction. This document removes this restriction by introducing a
new SDP attribute.
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