According to RFC3605 what you suggest is correct and permitted:
===
<quote>
rtcp-attribute = "a=rtcp:" port [nettype space addrtype space
connection-address] CRLF
In this description, the "port", "nettype", "addrtype" and
"connection-address" tokens are defined as specified in "Appendix A:
SDP Grammar" of [RFC2327].
Example encodings could be:
m=audio 49170 RTP/AVP 0
a=rtcp:53020
m=audio 49170 RTP/AVP 0
a=rtcp:53020 IN IP4 126.16.64.4
m=audio 49170 RTP/AVP 0
a=rtcp:53020 IN IP6 2001:2345:6789:ABCD:EF01:2345:6789:ABCD
<endquote/>
I see a range of devices out there that claim to support RFC3605, so this is
clearly used out there. However I've never come across it's use and can't
guess what the chance of the far-end you're talking to supporting it is.
Matt
________________________________________
From: peeyush jain [jainpeeyus...@gmail.com]
Sent: 14 June 2013 21:50
To: sipp-users
Subject: [Sipp-users] Usage of unicast ip in attribute param
Hi sipp users,
Can my sip sdp body contain something like this:
a=rtcp:6001 IN IP4 [local_ip]
That is specifying my rtcp port number as 6001 and ip-address to be
given by [local_ip].
Is specifying ip in a line for rtcp legal/valid?
Thanks and Regards,
Peeyush Jain
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