[sip-comm-dev] Can i run mutilple sip clients in a user PC



      I tried to run three sip-communicator in a single PC. Then i monitered the packets using
Ethereal. In RTP pckts the source and destination Port is the same.

This was actually done on purpose as it helps in NAT & Firewall traversal.

I have configured different
ports before starting. Kindly get back to me whether it is possible to RUN multiple SIP in a PC.

Well it depends. It should be possible but only one of the clients would
have access to capture devices. You could try and configure the other
one to read and send the contents of a file (i.e. using the MEDIA_SOURCE
property )



Can u please eloborate on how this solves firewall issues. Let me try to explain my problem

I have two clients A and B running on same (or different) machines. Lets say "A" uses port 5004
and "B" uses port "6004". The following is the expected behavior.

1. "A" invites "B", the SIP request will have the audio port as 5004.
2. "B" receives this and knows that "A" will be send AND receive the data at port 5004.
3. "B" sends an OK with audio port 6004. Now, A knows that B will send AND receive in port 6004.
4. Hence, all RTP data from A to B must have src port as 5004 and dst port as 6004...
5. All data from B to A must have src port as 6004 and dst port as 5004.

The problem that I face is, instead of step 4, A sends data with SRC PORT AS 5004 and DST port as
5004 and 6004. Similarily from B to A. This I beleive must be an issue in SIP communicator. Is my
understanding right.

the boy next door,

evr ur's


Luv & b Luvable


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