UC320W Voicemail Greetings garbled when calling over SIP Trunk

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Feb 15th, 2012
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Running FW 2.1.5 and when calling inbound over SIP trunk and call is transferred to VM, the greeting played is garbled. Issue also with FW 2.1.4.

A similar issue exists per post https://supportforums.cisco.com/thread/2128159 however NAT Keepalive has been since turned off and still running into the issue.


Internally when dialing voicemail the greetings played is very clear and the issue is only when calling over SIP trunk. Codec is set to G711u.

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Haresh Khemani Fri, 02/24/2012 - 12:56
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UC320 by default uses RTP p-time of 30 ms which was causing jitter when listening to voicemail greeting over SIP trunk. Used the MitTel PMF file that changed it to 20 ms which worked for Prodosec SIP trunk in Canada.

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