Hi. I've noticed that our incoming calls have the leading 0 digit chopped off them. IE 02920 111111 is appearing as 2920 111111 . Obviously when we miss a call and try to redial it wont connect because the number is invalid.
I've done an ISDN q931 debug and it appears that the number is coming in from the telco, in this case BT, with the leading 0 digit removed.
Is my call manager stripping it off the leading 0 or is BT not supplying me with a complete number?
Re: Telco chopping off leading 0 of incoming calls?
We got to the bottom of this issue with BT, after a lot of digging.
Apparently it's down to Q931 and Q931e circuits. Q931 signalling allows all the digits including the leading zero to be sent by the Telco. Q931e is the more modern version, and because the Telco apparently can't tell whether the call originated internationally or nationally, it doesn't include the leading zero.
BT can now only supply Q931e circuits, so you have to do other translations to get the leading zero visible. If you went to a supplier such as Cable and Wireless, they can still supply Q931 circuits and you get the leading zero.
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