Problem dialing from CUCM 8.6.2 to Tandberg/Codian ISDN Gateway
If there is a long silence it is possible you have an overlapping dialplan and CUCM is waiting for more digits. Once the interdigit timeout timer expires it sends your call to the GW. It is also possible your are sending a number to the GW it can't correctly handle.
I would suggest running the debugs "debug isdn q931" and "debug h225 asn1" to look at what is being sent.
I would also look at the dialplan in CUCM for route patterns that overlap like:
Such a situation would cause CUCM to wait for a fifth digit.
Re: Problem dialing from CUCM 8.6.2 to Tandberg/Codian ISDN Gate
I recently came across the article you linked above for setting up the ISDN GW as an H.323 gateway. I have the same environment in a lab as you described verbatim. Originally I was experiencing the same problems as you. Instead of setting the gateway on the CUCM to the IP of your ISDN GW set it to your VCS control instead. Since your ISDN GW is registered to your VCS it will send out Admission Reject (ARJ) if you look in the H323 log on the ISDN GW. The article linked above appears to only work if you are using the ISDN GW's built in gatekeeper. Since you have a VCS as your gatekeeper this should work for you as it did for me.
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