[cisco-voip] Unity Connections (Native Transcoding)

[Mark Marquez]

I hope someone can provide some help. Below is an explanation of my  iissue.

In Unity Connections I've set the Port Group settings to only advertise G711 mu-law.  From reading I found that Unity Connections does Native Transcoding. My remote branch devices are set to use G729 over the WAN.  When I dial voicemail from remote branch phones using either the Pilot number or by using the Messages button calls get a fast busy.  If I re-add the G729 codec to the advertised codec list on the Unity Connections Port Group then calls complete. Apparently Native Transcoding on the Unity Server is not working. I do have hardware transcoding resources available to the phones in question but they are not getting invoked. My understanding is that this is normal since Unity Connections should do the transcoding natively via its CPU.  Any help is appreciated.
BTW, phones at headquarters which are set to use G711 do work when Unity Connections is set to only advertise G711.  Remote branch phones connecting over the WAN using G729 fail.


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