I need help with SIP registrar server location technique.
RFC 3261 claims that registrar can be a separate element from proxy server.
Following this, please help me to understand how SIP proxy can find registrar server ip address to forward
REGISTER messages to it ?
For example. We have domain biloxy.com, sip proxy is proxy.biloxy.com, registrar is registrar.biloxy.com
Proxy received this Request:
REGISTER sip:biloxi.com SIP/2.0
Via: SIP/2.0/UDP user1.biloxi.com:5060;branch=z9hG4bKnashds7
To: User1 <sip:email@example.com>
So what proxy needs to do ?