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mgcp qsig - one way audio

Hello Experts,

We have hybrid telephony environment where we are using MGCP QSIG to interconnect CUCM and Siemens. We have one E1 PRI configured for QSIG MGCP PRI.

Siemens Phones  <----> Siemens TDM <----> VG30D <-----> 2911 ISR <----> CUCM <----> Cisco IP Phones

Siemens Redirected Number ----> Hunt Pilot

We have started experiencing one way audio problem between calls from CUCM IP phones to Siemens Forwarded Numbers only. The one-way audio happens only with forwarded numbers. We have few numbers forwarded to huntpilot numbers. When calling the huntpilots directly we don't see a problem. When calling the redirected number we see the one way voice issue.

For your information, We did upgrade out CUCM 8.5.10000 to 8.5.139000 last week.   Thanks for your time and help on this.

Best Regards,

5 REPLIES
Cisco Employee

mgcp qsig - one way audio

Hello,

Cisco Phone calls a Forwaded number - Hunt pilot - PBX phones -> one way audio issue meaning Cisco Phone can't hear PBX phone ?

Cisco Phone calls Hunt pilot - PBX phones - works fine.

So Hunt pilot is configured on PBX ? Forwarded number means , could you pls brief here ?

Thanks

Siva

New Member

mgcp qsig - one way audio

Hi,

Cisco IP Phone ---> Hunt Pilot ----> Works Fine

Cisco IP Phone --> Number in Siemens (Forwarded to Hunt Pilot) ---> One Way audio problem - Cisco Phone User can hear but the Siemens Phone user Could not hear.

Yes the Hunt Pilot and Redirected number both reside in Siemens System.

Many Thanks

Cisco Employee

mgcp qsig - one way audio

Hello,

I get you.So in the below call flow , try to collect packet capture at 2911 GW and see, is there 2 way audio or not.In this way, we can isolate the problem meaning Cisco Phone , CUCM sends the RTP stream till GW or not.

Siemens Phones  <----> Siemens TDM <----> VG30D  <-----> 2911 ISR <----> CUCM <----> Cisco IP Phones

Thanks

Siva

New Member

mgcp qsig - one way audio

Just curious was the solution to your issue was.  We are experiencing a similar problem.

Thanks

Dave

mgcp qsig - one way audio

hi,

1. Did this issue start after a callmanger upgrade?

2.can you upload the following

  -debug isdn q931

  -debug mgcp packets

Thanks,

Karthik

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