[Serusers] Forwarding to SIP proxy

[Marc Khayat]

If I do the following:
GW calls SIP proxy : works
However, I'm trying to forward (stateful) a call to a SIP Proxy, but it
seems that it's failing.
This is my scenario:
GW -> SER calls SIP proxy: fails.

This is my ser.cfg

if (uri=~"^sip:123") {
  t_relay_to_udp("Proxy_IP", "5060");
  break;
};

I thought that it's the same as a GW, but it seems that I'm wrong.

Help is appreciated :)