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H323 phones out SIP trunk losing beginning of some announcements

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rejackson

IS-IT--Management
Oct 4, 2005
627
US
I have h323 telephones on making phone calls out a SIP trunk. The phones are registered to the avaya communication server and the call set up goes between the phone and the comm svr. When the call is set up the voice traffic goes between the phone and a local media gateway which connects to a medres at the central site where the conversion to SIP happens then to a session border controller and out the SIP trunk.

The phones are not hearing the first 1-2 seconds of some announcements when they call out to some conference centers.

I can capture the call outside of the session border controller with wireshark and replay it and I hear the whole message coming in.

I have captured the call inside of the SBC but Wireshark cannot identify it because the SIP signaling goes between the Avaya Session Manager and the SBC and the voice traffic goes between the SBC and the medres.

I have also captured the H323 traffic between the phone and the the Avaya CM and the voice data between the phone and the local Media gateway. I have the same problem with that traffic and wireshark not seeing the connection between the two data streams.

Just wondering if anyone has an idea how I can tell where the parts of the message are being lost.
 
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