[Serusers] SRC Port Change

Andrei Pelinescu-Onciul andrei at iptel.org
Thu Nov 3 11:32:34 CET 2005


On Nov 03, 2005 at 14:49, Ritesh Jalan <ritesh.j at net4.in> wrote:
> Hi
> 
>  
> 
> Pls. help us in resolving the problem that the SIP proxy server changes the
> Source and Destination port while replying for message. Pls. find the below
> message for the Reference In below message A cisco ata device (which is
> behind NAT with IP 192.168.10.52) is trying to register it self with SIP
> proxy server IP 172.16.101.10 with SRC port 5060 and DST port 5060, but when
> SIP proxy server replies back to the message the port number gets changed
> i.e SRC port 53492 and DST port 5060. Is there any way by which we can fix
> this port num.


ser never changes the source port number on udp, it always reply on the
same port it has received the message on.

Are you sure you don't have another nat or a firewall in the way that
does this?
Could you take the network dumps on the sip proxy?



Andrei




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