I have a 3300 setup to do SIP with a local provider. Everything seems to be working well with the exception of ringing another device at a branch location on a different subnet.
If I have the DID resolve to an extension in Head Office it works fine. When I change the DID to ring a set in a branch location I get one-way audio.
I believe that the 5330 set is trying to talk to the IP address of the SIP Peer directly and not bridge the call through the Mitel 3300 controller.
Is there a way to force the call to only use the Mitel 3300 controller?
For example the call comes in on 1.1.1.1 and connects to my Mitel at 2.2.2.2. Mitel on 2.2.2.2 calls extension 3.3.3.3. I don't want 1.1.1.1 to talk to 3.3.3.3 directly. I want the Mitel 3300 at 2.2.2.2 to retain call control.
Any suggestions?