Dan231,
My assumption here is that this feature is working for more than 1 extension, and none of the CPNs are the same as the BTN (Billed Telephone Number).
With that being the case there are no other settings required to make this work. The only issues that I have run into on this are:
1. Feature not supported by carrier; not the issue if it works for everyone but those 3.
2. The number used is a non-native number to the circuit being used. This means that the number is not associated with the ISDN or SIP carriers trunking that the call is going out on. This would either block the call from going out or default to the BTN; carriers choice.
3. The number was not entered as the full 10-digit number. This would default to the BTN.
Have you tried changing the numbers to something else to see if it works? Try a number that you know works, other than the BTN.
Thanks,
TE