Hi!

When using UDP for transportation the sofia-sip stack uses the same 
socket (same src port) for all outgoing logical connections. This is not 
the case with tcp. If I want to do a REGISTER with my proxy/registrar, 
the sip stack creates a new tcp connection (with some arbitrary src 
port) but does not insert this arbitrary port into the contact header. 
Instead, the contact header's port is set to the one of the tcp-server 
socket listening in general at port 5060. Hence, the registrar opens a 
new tcp-connection to my UA.

So could someone give me please a hint how to force the REGISTER-socket 
to a port of my choice or how to get the real port into the 
contact-header-line? Or is there any other possibility to have only ONE 
tcp connection to my register with the UA always being the client?

thanks for any advice,
cheers,
flo

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