[SIPForum-discussion] recvonly in sdp

[Prem chandiran]

Hi all,
for putting a caller in call hold we are sending the following sdp.

v=0
o=46727870367 1338208426 1338208966 IN IP4 10.47.16.5
s=SCM
c=IN IP4 0.0.0.0
t=0 0
m=audio 37384RTP/AVP 0
a=ptime:20
a=rtpmap:0 pcmu/8000
a=recvonly

my question is when we send a=recvonly at that time do we need to mention
port in m attribute as mentioned in the above example or we have to give
port as 0 in m attribute?. i checked rfc 4566 in section 5. SDP
Specification i am able to find an example which is similar to the above
sdp. but still i am raising this concern since i am unable to find any line
in the rfc 4566 specifying while sending recvonly sdp must have m attribute
port as 0 or any valid port number.  if any rfc is there plz mention the
same . I kindly request you all to help in this.

Thanks,
Prem
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