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Conferencing issue between the CCM Clusters

Hi,

We are running CCM cluster 4.1(3) and MGCP Gateway.

For conferencing we are using NM-HDV with Two numbers of PVDM-12 DSP Modules.

Presently we are facing a problem during a conference between another CCM cluster.

During the conference ,we cannot hear the voice from PSTN (one of the Confree), but he can

able to hear our voice.

Between the cluster we are using g729 Codec.

Conference within the cluster and PSTN is working fine( within the cluster we are using g711 Codec).

In the Gateway (at our end)we configured as below:

dspfarm transcoder maximum sessions 1

dspfarm confbridge maximum sessions 5

dspfarm rtp timeout 60

Can some one help me out !!!

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