SIP trunk codec

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Aug 11th, 2007
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Does anyone know if it is possible, in CM 4.2.3, to select a SIP trunk codec other than g711ulaw and g711alaw? Those are my only two options in the trunk drop down box and I would like to try g729.


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kelvin.blair Sat, 08/11/2007 - 19:43
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G711ulaw and alaw are your only options. Now what you can do is have a device in the middle for example an IP2IP gateway to covert h323 to sip and then you can use g729, but you will need a lot of transcoders depending on the call volume. So from Call Manager you will do an h323 gateway to a Cisco Router and once in the gateway then you can send the call via sip to your sip provider.


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