No Ringback for intermittent PSTN calls from cisco IP phones

[rohit.dalvi11]

Hello,

CUCM release :10.5

When we make PSTN outgoing calls from the IP phone, we cannot hear the ringback at our end. The calls rings at other end and when the person receives the call he hears his own voice when he speaks. Its complete silence at our end. This issue happens for intermittent calls.

We have one publisher and 3 subscribers which are at multiple locations. This issue has been reported  only at one location.

Any assistance is appreciated.

Thanks!!

[Carlo Poggiarelli]

Hi.

What kind of signaling protocol are you using between VG and CUCM?

Let us know

Regards

Carlo

[rohit.dalvi11]

Hello Carlo,

We are using MGCP between VG and CUCM.

Just wanted to know if this can be caused due to shortage of DSP resources??

If yes, then  how do we conclude the same.

Thanks!!

Rgds,

Rohit

[Carlo Poggiarelli]

Hi Rohit

Please post the output of a show inventory, show diag and show controller E1 (or T1)

Thanks

Regards

Carlo

[rohit.dalvi11]

Dear Carlo,

Please find attached the output for show inventory, show diag and show controller E1

[Carlo Poggiarelli]

Hi Rohit,

I also need your actual config and the output of a couple of a debug isdn q931 for one working and one failing call.

Thanks

Regards

Carlo

[rohit.dalvi11]

Dear Carlo,

As requested,

Please find the attached Output of Good & Bad Call FYR.

Request you to Please analyze & comment on this.

[Mohammed al Baqari]

Hi,

During a bad call, if you double press on the help button of the phone '?', can you check if RX/TX counters are increasing.

[Mohammed al Baqari]

Hi,

It sounds to be that you have a routing problem between MGCP gateway and phones. Signaling path is working but media path isn't.

During faulty call, please share the output of 'sh voip rtp conn' and 'sh call active voice br'. Indicate the call number as well.

The 'show voip rtp conn' output will give the IPs of both call parties (gateway and phone). Try to ping the phone IP from the gateway using ping x.x.x.x source y.y.y.y

[rohit.dalvi11]

Hi Mohammed,

PFA the output for sh voip rtp conn' and 'sh call active voice br' during faulty call. We pinged the IP phone from the gateway and were successfully able to ping it. 

Phone IP: 10.2.233.148

Gateway IP : 10.2.100.20

[Mohammed al Baqari]

Hi,

Can you try the following ping

ping 10.2.233.148 source 10.2.100.20

[inderpreetsingh23]

Hi,

Can you post the debug mgcp packets output for the calls?

Thanks