CCM and CCME : Cannot Transfer Call

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May 13th, 2008
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I have problem about call transfering.

I Explain:

In the side A,I have a Call Manager with a Voice Gateway (c2821).

In the side B, I have a sample Voice gateway that use an FXS (c1751v).

For the communication, There is a SIP trunk between The CCM6 and the c2821.

There is a h323 trunk between the c2821 and the 1751.

I can call from the CCM (using an IPPhone) to the 1751v'phone.

I cann call too from the 1751v to the CCM.

So the schema is :

IPPhone(dn:4001) <-> CCM <- SIP trunk -> c2821 (Edge Router) <- H323 (like internet)-> c17V1 <- FXS -> Phone(dn:3001).

Problem :

In the Call Manager, I cannot transfer the call.

e.g : ther is another ipphone in the call manager : dn 4002.

When the call from 3001 arrives in the 4001, I want to transfer it to 4002.

In the CCM, I transfer the call : push button "trnsfr",compose the 4002 and push transfer button.

Result :

The line can be transfered but there is no sound.

And after 10 seconds of "no sound", the call is hanged up.

What is the cause?

Is there any issue?

The link is fully Cisco.

Thank you.

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Jaime Valencia Tue, 05/13/2008 - 09:19
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does the trunk has the MTP required and is also an MTP available for the CME?



if this helps, please rate

connect101 Mon, 05/19/2008 - 03:23
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The trunk has the mtp required.

What do you want to say about "MTP available for the CME"?

I've configured an MTP in the router CCME.

This CME is my voice gateway too.

Another question, what is the port used by the mtp. I want to use the solution with a firewall (pix).

The schema is : CCM <-> PIX <-> CCME (Gateway) <-H323-> Another CCME.

Between CCM and CCME is SIP trunk.

connect101 Tue, 05/20/2008 - 07:51
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now, i've changed the codec in the IPVMS.

And i can hear the MoH.

If the call is from the outside (VoIP),

then it can be transfered and parked.

If the call is from the inside, then it cannot be transfered, but can be parked once.

I can push the button transfer, and transfer it to another ipphone, but the receiver ipphone dont receipt the transferd call, and the distant phone hear nothing.


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