I've seen this happening when a media server is sitting in between the 2 UA's ,
but not in the case mentioned below. I think what Kasturi has derived is
correct.
cheers,
Amith
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of Kasturi Narayanan
Sent: Thu 1/19/2006 3:20 AM
To: 'Voipers Portugal'; [email protected]
Cc:
Subject: Re: [Sip-implementors] SIP - SDP - RTP
The only wild guess could be
The softphone thinks that the other end is behind a NAT/FW and hence by
sending to the same source port it thinks it can get thru the NAT.
Kasturi
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Voipers
Portugal
Sent: Wednesday, January 18, 2006 12:02 PM
To: [email protected]
Subject: [Sip-implementors] SIP - SDP - RTP
Hi,
I have a doubt using the SIP SDP messages. When the softphone receives
the
SDP message (in the 200 OK message) and the media port is for example
10002,
that is, when the softphone wants to talk, it should send RTP messages
to
that port. What is happening is that, the softphone receives media from
port
20000 (for example) and answers back to 20000 instead of the 10001 that
was
expected. Any idea why this happens?
Jose Simoes
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