Cannot make toll free number 1800xxxxxx

[tj6512]

I have a Cisco Call Manager (MCS 7835), I have created a route pattern on my Call Manager, 1800xxxxxx that points to my PSTN gateway. But, whenever I try to make a toll free number with my (LAN-based) IP phone 7960, I found that the call does not even reach the PSTN gateway router (AS5300). What could be the problem ? What trace (SDL/SDI) can I employ to trace the call setup problem ? Please help.

[tj6512]

The root cause had been identified. I did a command "debug voip ccapi inout", I found that whenever I dial to any destination number that begins with "1..." eg 1800-xx-xxxx, 10x, etc, I will find that there is always not a valid destination number of 71180318 whenever I dial 1800-xx-xxxx or 71180310 whenever I dial 10x.

This is because the number expansion that I have configured on my local PSTN gateway (for a previous purpose which is no longer valid now), will always wrongly translate my correct destination number to the wrong number, due to the first 2 number matching in the number expansion entry.

Right now, I can make calls to 1800-xxxx and 10x.