Frontline,
I think you are putting way to much thought into this one. When setting the E.164 flag on your SIP trunks it will put a + in the front of the CPN associated with the caller since that is the part of the format we can't add to the CPN; we can add the country code though. The way E.164 works is that you have a + in front of the country code [1, 01, 00, etc..] so that the switch knows the country of origin. Most SIP providers know what country they are in and add that themselves, but a few don't do this for whatever reason.
If each of your users are using a separate CPN then you will need to add the 1+10 digit phone number. For example if I had the DID range of 340-558-1000 through 340-558-1999 and each of my users had their own number they wanted to send out this is what I would have to do.
Go to System > Devices and Feature Codes > Phones > 1001 > Calling Party Number: 13405581001
That way when the call goes out it will go out as +13405581001 as you have turned on E.164 within your SIP Peer Profile. If no one is sending out anything different then you can just force sending out the main number like this.
Go to System > Devices and Feature Codes > SIP Peers > SIP Trunk Groups > 92002 > Trunk Group Configuration > Calling Party Number: 13405581000
AND
Go to System > Devices and Feature Codes > SIP Peers > SIP Trunk Groups > 92002 > Trunk Group Configuration > Force Trunk Group Party Name and Number: Yes
This way all calls going out will use +13405581000
The reason for all of this is that the system can be used in multiple countries and by default the CPN, in the US, has to be a minimum of 10 digits, but if you need to add the country code, 1 in the US, then you can add that to the CPN as well.
Thanks,
TE
