SIP trunking is not always easy. Several SIP trunk providers have been tested with the Toshiba CIX and they usually have a quick setup guide. You should be OK with many SIP trunks, but Toshiba isn't going to be 100% compatible with all of them. Also the tech support may not be familiar with Toshiba.

Firmware will make a difference, both on the MPU and the CIX software. I saw a case where the CIX would not register to the SIP trunk until the firmware and software was upgraded.

One, FYI, the Server registration never worked, and really you would never need it. In some cases you could use None, but usually you use Client registration.

Getting it all working correctly is a bit of a challenge. Since you are completely blind on the CIX side, you will need some help from the provider. Hopefully they can see something in the registration that can be adjusted, but most of those guys are probably more familiar with Asterisks systems.

So I Suggest getting some more information about what they see during registration and see if you can get to the system up to the latest version the MIPU firmware (2.20) and the CIX software (5.20.MT81)




David
Tele Express Business Systems