Calling to Trunk SIP, I not hear the first 10 seconds of audio

Hi guys,
I have problem with the calls to a trunk SIP. In some calls, i not hear the first 10 seconds of audio.
Scenario
PSTN--->GW MGCP---->CCM--->Trunk SIP---PBX SIP with IVR
The trunk SIP is using MTP (MTP checked).
The capture show a parameter a:inactive
Please your help
Thanks a lot

Hi,
MTP should be checked since the third party SIP phone support only RFC 2833 DTMF method and DTMF RFC method should be RFC 2833 OR OOB & RFC 2833.
(SCCP Phone support both inband and out of band)
MGCP would be configured to support OOB.
From the SIP profile configuration you can select the early offer mode for all calls.
For Early media it requires a PRACK message (SDP answer) as response to 183 session in progress (containing SDP offer).
I think as from the setup as you presented it should work fine with MTP checked, DTMF method as RFC 2833 and from SIP profile it should have Early offer.
I would like to see the SDI or SDL traces for that particular call.
Even I have the same setup for one of my client (CUCM with Genesys Contact center).
I can provide you the SIP Trunk working configuration.
One query from your attached text file, if you say MTP unchecked then the content length should had been 0 (i.e no SDP parameter).
Please clarify.
Kind Regards,
Raaj.

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Author:   [email protected]
Date:     2010-07-15 07:38:44 -0700 (Thu, 15 Jul 2010)
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Calling to Trunk SIP, I not hear the first 10 seconds of audio

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