1 Feb
2006
1 Feb
'06
4:30 a.m.
You are right. The UA of user B needs to support symmetric RTP. Their is also
an extension for SDP called co-media which allows you to explicitly tell the
other side "I will start the media stream" or "you should start the media
stream". But I think it is not a standard yet, and not too much vendors
implemented the draft yet.
Nils
On Tuesday 31 January 2006 03:16, Istvan De wrote:
Hi!
I've read about the above topic in the arcives and now I've got the same
problem.
User A is behind a symmetric NAT -> a new port is bound for every
different
(external ip, external port) pair.
User B has a connection to the net without any NAT or firewall.
User A wants to have a SIP+RTP session with user B. How?
I guess basically what is needed is forming of a SIP
message like "send the your reply to the same ip and
same port from where you have received this" and user
A can send this to user B.
For the RTP session, a pretty similar thing would be
needed like, A says to B: "I send you the RTP stream
on your x port, send your rtp stream back to the same
ip and port from where you receive mine".
How to setup such a SIP packet?
Or maybe there is a standard solution for this already?
(STUN wont help in this case I guess, and TURN is not
an option for me.)
I've read about "symmetric SIP + symmetric RTP" maybe
that is the same as I've described above?
Thanks
Istvan
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