VCS with Mu - Law when the SIP media processing

Hi guys, I have a very specific behavior.

A customer has problems to integrate a VCS Starter Pack X7.2.1 with an Alcatel PBX with a SIP trunk.

The problem is:

This PBX is in Europe, so that it uses A - Law (they can´t change this).

When a dial an extension using H323 as protocol endpoint, I can force the Protocol G711 A - law on the trunk SIP (generating SDP interworked), but when that point of termination (C20 runningn TC5.1.4) using SIP, the PBX Don t accept a p2p support. It must be mandated by the VCS.

If force us the media through the VCS (by using encryption B2BUA or SIP Lock Mode), the codec negotiated btw VCS and endpoint to the title of this first step is G711 Mu - Law (PCMU) and the accepted PBX codec is PCMA, causing a shift and a loud noise in the call.

No idea if we can force or configure VCS to use G711a as the Protocol when a SIP - SIP call with stream media through VCS?

PS: I think that this isn't a problem in the United States, because they use the Mu - Law encoding.

Thank you

Can you put a cap set the filter on the endpoint at all?

xConfiguration Experimental CapsetFilter: "G.711mu"

Thank you

Guy

Tags: Cisco Support

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