We have Unity 3.1.4 using dual integration with a HICOM & CCM, the call from a HICOM phone works ok and we get the system greeting. We are using the lastest TSP and calls to from IP phones to unity subscriber boxes were ok, suddenly they have stopped working, calls from the HICOM are still ok, but Unity answers with silence. We have reinstalled the TSP and tested this, rebooted but still no change, we have not installed the g729 codec as we are running on a LAN and as far as I am aware using g711 only.
I have seen this issue before with G729 based wan links carrying voice adding the codec to unity seemed to fix this. However this time it has been working and just stopped and as far as I am aware using G711.
Sounds to me like one-way voice which is typically IP related, not codec related. For codec related issues the calls don't connect at all.
A sniffer trace will give you the most actuate picture of what's going on. Make sure Unity doesn't have 2 NICs or 2 IP addressed. If you have 2 NICs you must disable one. Make sure you have a route between the phones, gateways and Unity.
Are calls from IP phones just getting silence for the first 15 seconds after Unity answers and then the prompts start playing? If so that is just a configuration issue with the ports. Verify in the Unity SA under the Ports link that ports are assigned to Call Manager, if you recently uninstalled the TSP and reinstalled you have to reset the port settings, then restart Unity.
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