Inter-Cluster Trunk CCM PBX: local echo when MTP required is checked

[guilhem.perez]

Hi,

I set an Inter-Cluster Trunk between my CCM and a PBX.

If MTP required is not checked, I haven't audio problem but I can't hold, transfer...

If MTP required is checked, I have audio problem (a "local" echo on H323 phone registered to pbx) and no problem with hold, transfer...

Does somebody know how to solve my issue?

Best regards.

Thanks

[wbreitzke]

It look like problem related with Gateway , upgraded the gateway to 12.4.6T. MTP is being used on callmanager to provide

supplementary service.

[dgahm]

Echo results from the audio signal being reflected back to the talker with delay. In your case that reflection is coming from the MTP, so you need to focus there. What flavor of MTP are you using? Is it software or hardware? Can you try a different MTP resource? If hardware DSP farm are there errors?

Please rate helpful posts.

Dave