Hi sip-implementors,
Below is an SDP example in RFC 3556:
v=0
o=mhandley 2890844526 2890842807 IN IP4 126.16.64.4
s=SDP Seminar
i=A Seminar on the session description protocol
c=IN IP4 224.2.17.12/127
t=2873397496 2873404696
m=audio 49170 RTP/AVP 0
b=AS:64
b=RS:800
b=RR:2400
m=video 51372 RTP/AVP 31
b=AS:256
b=RS:800
b=RR:2400
Assuming there is an unicast point-to-point session (A-B), above SDP is the
offer made by endpoint A, and endpoint B accepts the offer and agrees with the
same bandwidth values in the answer. "b=AS" modifier specifies the RTP
bandwidth, "b=RS" and "b=RR" modifiers specify the RTCP bandwidth for sender
and receiver respectively. In this point-to-point session, both A and B are the
sender.
My question is: does the b= line value specify the aggregate bandwidth limit
for the whole session (including endpoint A and B) or just the bandwidth limit
for local endpoint? Using audio media as an example, how much RTP bandwidth
should be allocated on the endpoint A? 64 or 32kbps?
Thanks,
Yong
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