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New Member

Hardware conferencing problem with CUCM 6.1


I'm facing a problem with the hardware conferencing ressources used by a CUCM 6.1.

So I have only one CUCM who is configured with the hardware ressource of a 2811 (2 x PVDM2-64, IOS c2800nm-advipservicesk9-mz.124-20.T2.bin). The HW conference bridge is registered into the Call Manager and when I look at the SCCP status on he router it is UP and ASSOCIATED.

But when we do conference (even with internal DNs) it is not working, we can not heard anything. The DSPs seems to be used. A strange thing is, during a non-working conference when we press the "Hold" button then "Resume" the conference is working (sounds enabled) for the phone.

My SCCP configuration is as below:

sccp local Loopback0
sccp ccm identifier 1 version 6.0
sccp ccm group 1
associate ccm 1 priority 1
associate profile 1 register PAZ-VG-HW-CFB
associate profile 5 register PAZ-VG-HW-XCOD
dspfarm profile 5 transcode
codec g711ulaw
codec g711alaw
codec g729ar8
codec g729abr8
maximum sessions 32
associate application SCCP
dspfarm profile 1 conference
codec g711ulaw
codec g711alaw
codec g729ar8
codec g729abr8
codec g729r8
codec g729br8
maximum sessions 2
associate application SCCP

I have attached you the full configuration of the Voice Gateway (it is an SRST one also and in SRST mode internal conferencing is working).

Thanks by advance for your help.

  • IP Telephony
Cisco Employee

Re: Hardware conferencing problem with CUCM 6.1

Don't think its a config issue as nothing jumps out there....

Can you setup a conf with no audio and grab following ?

sh sccp connect

sh voice dsp

sh voip rtp connect

sh dspfarm all

sh voice dsp group all

Also, just curious if the dspfarm GW has been reloaded after the

conference config was built?

New Member

Re: Hardware conferencing problem with CUCM 6.1

Hi Dilip,

Please find attached the configuration you have requested.

Also I have change a few the configuration (se attached) but the problem is still there.

And yes the 2811 Gateway hosting the dspfarm has been reloaded after the whole configuration set.

Thanks by advance.