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DID Problem on 3640 H323 GW and Lucent G3 PBX

I have been experiencing some problem on our 3640 Voice gateway. Based on this document shown below, I configured 3640 router as a T1 cas gateway.

When I call into Lucent G3 PBX from my IP phone, users on G3 can receive calls without any problem. It works great. But when the users on Lucent G3 try call into IP phones, they always get busy tone. It never opens up dial-peer. I took several debug logs on 3640 gateway. What I knew was that VoIP GW definitely receiving call from G3 PBX and I can recognize DTMF tone on debug vpm dsp log.

I once gave up DID, removed "Direct-Inward-Dial" line out of dial-peer. It started working and I was able to receive calls from G3 phones. But this case, users have to wait for 10 second. I know I can modify timeout value to reduce waiting time to complete calls. I just simply want use DID. I am wondering how come DID doesnft work on this configuration. The IOS version of the 3640 is 12.2(1). Does anyone have any idea?


Re: DID Problem on 3640 H323 GW and Lucent G3 PBX

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.