I have a 2811 with CME 4.2 that is working fine for SCCP handsets, but I would like to use a couple of (non-Cisco) SIP devices. Is this possible? I can't find any good documentation on whether this is even possible, let alone how to do it!
I am partway there, but when my SIP device tries to login it gets a 503 message back from CME:
SIP/2.0 503 Service Unavailable - registrar unavail or not enabled
I think this means it is trying to pass the registration off to an external SIP registrar, but I have not configured one. Can I make the CME router a SIP registrar?
for authentication to work, make sure username in your SIP device is the same as number you are registering, and configured in the router in voice rgister pool and dn. Then configure this username, password and realm under voice register pool.
Hope this helps, please rate post if it does!