[OpenSBC] returned contact in upperreg mode

[digbea <di...@gm...>]

Hello!

I have an OpenSBC running in UpperReg mode, with UpperReg routes pointing to
SIP registrar on another host. When UAs try to register, OpenSBC correctly
directs all requests to the registrar and successfully registers himself on
registrar. But the Contact field in 200 OK message from OpenSBC to UA looks
like <sip:user@opensbcip:port> and UA fails to register. This behavior was
tested with several UAs, for example SJPhone (running on 192.168.100.50)
says following:

16:20:21 SIP.Registration WARNING   Registrar did not registered none of our
contacts!
16:20:21 SIP.Registration NOTICE    Foreign contacts returned by the server:
sip:user@192.168.100.10:5062
16:20:21 SIP.Registration INFO      Not registered sip:us...@ex...

Seems like I'm missing something. Is it an UA issue or OpenSBC bug or
misconfiguration or anything else?

Thanks!

-- 
digbea