We have integration between Cisco CUCM and Siemens PBX with Cisco 3845 ISR Router (also as SRST). The Gateway is Configured in MGCP. During normal operation, all the calling between Cisco IP Phones and Siemens extensions is fine. All the extensions from Cisco and Siemens are able to Dial to PSTN and receive calls.
The Cisco and Siemens talk to each other over QSIG. In SRST mode, Cisco IP Phones work fine, make calls to PSTN and receive calls from PSTN,able to call Siemens extensions (& vice-versa), Siemens extensions able to receive calls from PSTN.
But Siemens extensions are unable to dial to PSTN.
The Siemens and Cisco systems communicate using QSIG trunks configured on the Cisco 3845 router.
The error seen on the debug for the outgoing call originating from Siemens Extension is " **ERROR**: CCPCC_CallOrigination: SETUP timed-out (2nd T303) to NETWORK. The SETUP failed."
The call flow is as follows:
Siemens extension ---> Cisco Voice Gateway (Port 0/2/0- Q-SIG Trunk) ----> Dial-Peer (destination pattern 9T and pointing to port 0/2/1) ---------> PSTN PRI E1 (connected to port 0/2/1). The calls fails with the above error.
Dial-peer voice 99999 pots
The calls from Siemens extension are routed over the QSIG trunk to E1 Port on the same router connected to ISDN PRI E1. The translations are working fine, the end digits sent to PSTN are the E.164 numbers.
If it is only occurring when the phones are in SRST mode, there is probably an alias command in the SRST configuration that is hijacking the PSTN calls when the associated phone is registered via SRST. Can you cut and past your configuration, or at least, the call-manager-fallback configuration?
Oh, wait, I just noticed that you are using MGCP normally. So in SRST, it would fall back to H.323. What dial-peer does the Siemens normally use via MGCP?
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