Receptionist experiences audio delay before she can hear the customer

Unanswered Question
Jan 19th, 2009

The setup is an 1861 with 5 IP phones. I am running version 12.4(22)T The receptionist is saying that when some calls come in from outside customers, she intermittently has a delay of 10 seconds before she can hear the caller's voice. What would cause this to happen? The config of the 1861 is attached. Thanks

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Nicholas Matthews Mon, 01/19/2009 - 07:42

What's the call flow?

Something like:




troymaki Mon, 01/19/2009 - 07:57

It should be like this:


The Call Manager is located in my office. It is version

Nicholas Matthews Mon, 01/19/2009 - 08:08

On CUCM, you can try two things:

On the H323 gateway:

Check MTP required

Enable Outbound Fast Start


Enable Inbound Fast Start

Sometimes we see long delays with H323 is required to do slow start.

Otherwise, it would require getting mgcp/pri debugs from the far end gateway, CCM traces, and H323/ccapi debugs from the 1861 - which is messy.




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