The T1 is working already for a few months now.
Its just that I wasn't able to update this thread.
Here is what happened.
Because of communication problem, there where things that wasn't really so clear. I don't speak japanese, and the NTT technical doesn't speak english either. So we have some sort of translator in between. I haven't been to the Japan office, all configurations/testing/debugs are being done from my desk. Translator was one of the staff on the Japan office. And also speaks little english. All work was done with the help of the staff in japan. They took pictures of the LED for the alarms, translate the recorded message when we tried calling the ISDN line, replacement of the cable during the loopbacktest.
NTT said that their ISDN PRI works with PBX only. It doesn't work with Cisco router/gateway. And they said that if we connect the ISDN line to a cisco equipment, they won't support it.
They said, it should be connected to a PBX first then the Cisco equipment is connected to the PBX.
We explained to them that we won't be using a PBX cause the router is a Gateway to a Cisco Callmanager. And putting a PBX in between makes no sense cause we'll still have a T1 connection from PBX to Cisco router. It will just be a waste of resources (buying another PBX?). They then point-out that their other T1 installed in that office was working fine for a few years now and its connected to a PBX (already existing on that site). So they are pretty sure that it works with PBX only.
After having the problem above, we gave them a call to check their equipment and the link. After a few days and a few visit after, they said that their equipment is working properly and they did a loopback test.
So I did a loopback test as recommended by crieman, there was no issue on the hardware and configuration. Everything was configured properly and hardware are ok. We even had TAC connect to the equipment to double check. TAC said everything is fine, the line had the problem.
After a month of having the problem and we're going nowhere, we decided to get a PBX to connect to the T1 line. We talked to the supplier who configured the existing PBX and see if they can rent us a PBX with T1 connection for a few days.
PBX supplier came in, attached the PBX to the T1. They try to configure it but they have problems too. They called up NTT. NTT arrived and check for problems. A few hours later, restarted all their active equipment on the site. T1 was up, we transfered it directly to the Router without configuring it in the PBX.
Router detected it us up, we tested incoming and outgoing calls thru the callmanager. Everything works.
NTT didn't say a word about it when they saw that it works with the cisco router.
Other than the physical and NTT problem, its pretty straight forward.
I did hear about the specific module for Japan, but when I talked to TAC, they said my existing equipment should work fine.
Hope any of those info helps.
