Caller does not hear a ringback

rarmitage · ‎06-22-2009

I have T1 connection between our Avaya System and Cisco Call Manager system using a Cisco 2801 mgcp gateway . When I make calls from the Avaya system phones to Cisco Call Manager phones everything works fine. The problem comes when I have a call come in through a PRI into to the Avaya system then routed over the T1 connection to the Call Manager system the caller does not get any ringback. The call goes through fine but the caller gets no ringback.

Call Manager Business Edition

System version: 6.1.2.1000-13

Any ideas?

Thanks,

Ron

Nicholas Matthews · ‎06-22-2009

Can you post 'debug isdn q931' for the bad call?

-nick

rarmitage · ‎06-22-2009

I can't do a debug on the isdn. The calls are coming over a T1 into the gateway, The PRI is going into the Avaya

rarmitage · ‎06-22-2009

I should say it is configured as a T1 CAS

parshah · ‎06-22-2009

Hi,

Is it a T1 CAS between Avaya and 2801 MGCP gateway or T1 CAS from PSTN?

Thanks,

rarmitage · ‎06-22-2009

The T1 CAS is between Avaya and 2801 MGCP gateway

rarmitage · ‎06-22-2009

When I did a sh voice call summary I saw that the VPM state of the call was

EM_WAIT_SETUP_ACK it stayed in that state until Voice Mail picked up the call.

9stucker · ‎06-23-2009

Give the following syntax a try.

voice rtp send-recv

rarmitage · ‎06-23-2009

Thanks but it did not help.

Nicholas Matthews · ‎06-23-2009

T1 cas is tougher, but the actual command that may help here is:

voice call send-alert

You may also get different results from this command:

voice-card 0

no local-bypass

-nick

rarmitage · ‎07-30-2009

We changed the T1 cas connection to a PRI and it works fine. Thanks for your help.