At 11:32 AM 6/26/2008, Dan Wing wrote:
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
> Behalf Of Sudhir Kumar Reddy
> Sent: Wednesday, June 25, 2008 11:34 PM
> To: [email protected]
> Subject: [Sip] can SDP contain 2 'M' lines
>
> Hi All,
>
> In SDP can we have two 'M' lines for re-INVITE i.e. for call hold.
>
> if yes what is RFC / draft
I have seen two responses that answer your first question and say 'yes'.
However, multiple m= lines are not used to put a call on hold.
indeed
1 (the same) m= line in sdp (offer) of reINVITE;
same Call-ID, From and To tag as original INVITE;
R-URI to same UA; (though I'm not sure if this R-URI can be to the
Contact address in original 200 OK);
same c= line;
*different* (1) or *new* a= line from
a=sendrecv
to
a=sendonly
the answer will be a=recvonly
(1) omitting a=sendrecv is ok in the original offer, since it is
implied unless a direction tag is explicitly different in any offer.
see RFCs 3264 and 4566 for more details
James
-d
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