We implemented a Unity server in Germany and are having issues dialing in via the PSTN to Unity. Calls coming externally in via PSTN get a fast busy. When we change the codec on the router to be G.711 ulaw everything is happy.
I believe what should be done is changing the codec on the Unity box to handle G.711 alaw for the default. I am not sure how to do this????
You can't change it in Unity. The Unity TSP can only support G.711ulaw and G.729a.
What you to do is use a voice class on the router to give G.711alaw precedence over G.711ulaw. That way all calls will do alaw but in the event alaw isnt supported by an end point (Unity) it will negotiate to ulaw.
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