Jaime Valencia Thu, 04/17/2008 - 18:13

the PSTN only handles PCM so there is really no choice, that's why when you make a call it uses a DS0 which are 64 kbps. it uses G711

HTH

javalenc

if this helps, please rate

Sushil Kumar Katre Thu, 04/17/2008 - 21:44

Hi,

As mentioned correctly by Javalenc, G.711 is always used for PSTN calls - 64Kbps consuming one channel for each call.

>> Sushil

Eric Krieger Fri, 04/18/2008 - 00:03

In addition to above, if you're after the used codec between the endpoint (IP Phone) and VoiceGateway (VG) (on your LAN/WAN), the Region setting of the Phone and VG in CallManager *and* configuration on your VG(codec class) determines the used codec.

Regards,

Eric

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