What Ketul says is true in most cases As soon as a party receives a 'valid' SDP from the other
side media can be sent. It happens in most situations that the INVITE contains the necessary SDP
information. In some cases your phone may not receive a 'valid' SDP in the INVITE.
Even with a 'valid' SDP a UAS may be put on hold or receive zero m-lines. There
are some variations to be taken care of.
Here is a reference to the offer/answer model.
ftp://ftp.rfc-editor.org/in-notes/rfc3264.txt. This document gives the necessary guidance.
It is important UACs and UASs adhere to this. The reason I say this is that important call flows
such as 3PCC rely on adherence to rfc3264.
Here is also a reference the the best practices on 3PCC:
http://www.jdrosen.net/papers/draft-ietf-sipping-3pcc-04.html
Thanks,
Ganesh
Ketul Sakhpara wrote:
Yes, media could be sent immediately on 200 OK.
--Ketul
-----Original Message-----
From: Jerry Yin [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, October 07, 2003 3:20 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: [Sip-implementors] When callee starts to send media?
Hi there,
This may be a pretty old question. Should the callee send the media after it sends 200 OK, or after it receives the ACK? I remember I saw somewhere that it should send the media immediately after it sends the 200 OK. But I can't find the exact words from RFCs.
Regards,
Jerry Yin
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