9951 phone problem

Unanswered Question
Aug 31st, 2010
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I have a new install of CUCM 8 running 79xx phones and 10 * 9951 SIP phones

Call routing as follows

inbound calls to a H323 gateway

Outbound calls first to H323 gateway, if fail then next to an MGCP gateway

everything fine with SCCP phones

on the 9951 phone - Inbound calls work fine.

For outbound calls really strange

All calls first routed to the h323 gateway, but on some numbers I get an incompatible destination ISDN error code and then CUCM sends call to MGCP gateway and call completes

On some calls on h323 gateway call seems to setup, but no audio, remote site does not ring and after 17 seconds ISDN drops call.

So in summary calls out via MGCP gateway are ok with 9951 SIP phone

calls out from 9951 SIP phone to H323 gateway do not work.

Cannot change the h323 gateway to mgcp as running a tcl fax detect script

Any help would be great



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ANDREW BERESFORD Wed, 09/01/2010 - 02:10
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I solved this problem by adding the command 'bearer-cap speech' under the voice port of the H323 gateway


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