“Cannot complete conference.” When I am trying to make conference with the PSTN Numbers

Nayeem M.V. · ‎06-29-2010

Hi All,

I have IP Telephony setup with CCME 7.0 and SIP trunk and I am getting the error as “Cannot complete conference.” When I am trying to make conference with the PSTN Numbers.

The sip dial peer used G729rb8 codec as per the ISP standard. As per my knowledge that conference feature doesn’t support G729 codec. Is it possible to do transcoding for the calls coming from the SIP dial peer leg , on the same CME itself without putting transcoder (router as a transcoder ) between the ISP and CME in the customer Local area network .

Please suggest

Nayeem

iantra123 · ‎06-29-2010

Hi,

Have you already tried to make conference with g711?

Can you give the running config

1/ In the DSP farm

2/ In the telephony-Service

Jaime Valencia · ‎06-29-2010

If your going to use DSPs you could configure a HW CFB or XCODER

Transcoding Support

Transcoding compresses and decompresses voice streams to match endpoint-device capabilities. Transcoding is required when an incoming voice stream is digitized and compressed (by means of a codec) to save bandwidth, and the local device does not support that type of compression.

Cisco CME 3.2 and later versions support transcoding between G.711 and G.729 codecs for the following features:

•Ad hoc conferencing—One or more remote conferencing parties uses G.729.

http://www.cisco.com/en/US/partner/docs/voice_ip_comm/cucme/admin/configuration/guide/cmetrnsc.html

The "Configuring conferencing" has the instructions for HW CFB.

HTH

java

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www.cisco.com/go/pdihelpdesk

HTH

java

if this helps, please rate