CUCM 8.5 to Shoretel Integration for call routing via 2921 MGCP gateway

[sbhavikj]

I have a requirement for Shoretel integration with CUCM for call routing. I configured the T1-PRI-QSIG between 2921 MGCP gateway and a Shoretel and the PRI is up. When the calls are placed, I see the call on the gateway but then immediately see a disconnect from router with cause 0x80AF - Resource Unavailable, Unspecified. IOS version is 15.0.1.M3. The DSP's (PVDM3) show no errors.The calls are G.711.

When the call is received on PRI from a Shoretel phone, I am seeing a different message "recovery on timer expiry". This is consistent. Am I missing something?

Any help/pointers greatly appreciated.

Thanks.

[Chris Deren]

Which side is configured as Network?

Have you rebooted the GW?

If you search for these error messages on this forum or google you will find quite a few good links. Have you tried it?

Chris

[sbhavikj]

Thanks for your reply, Chris.

I tried reboot of the router to no avail. The router is configured for Network and I verified that the T1 is clean with no errors. According to Cisco, this error is a temporary failure but in my case it is consistently failing.

Some online posts suggest DSP related issue so I have requested customer to upgrade the IOS to try.

Thanks,

Bhavik Shah

[Chris Deren]

What ISDN switch-type are you using? Is it the same on both sides?

Chris

[sbhavikj]

It is primary-qsig with variant ISO. Shoretel person confirmed this.

[sbhavikj]

The QSIG PRI is working now after converting the gateway to H.323. I suspect that the latency was causing the dropped calls as with MGCP, the latency between GW and CUCM was around 150 msec roundtrip.

Thanks for help.