Slightly odd one this. I have a user with a Siemens Gigaset 475IP DECT system which has one of its accounts registered with 3CX as an internal extension. The Siemens is configured to add a local dial code on all its VOIP accounts to any number not preceded by a zero (which of course includes internal 3CX extension numbers). Thus calling internal extensions doesn't work because they have a whole load of digits automatically put in front of the internal extension number before 3CX gets the number. BTW, this is a remote user who likes the ability to use the Siemens for normal (non-3CX calls) without adding the local dial code for VOIP dialling to local numbers. So whilst this feature could be turned off globally on the Siemens, it would "break" the other usage of the Siemens device. It does not appear to be possible to turn the feature off on a per account basis. Any way to use a 3CX rule to strip digits for internal calls?