Hello, I can't call back missed incoming international calls as the '00' is missing from the number. I have to edit the number to call it back. Local landline and mobile numbers are ok. I know that it can be fixed by adding a dial plan to the Caller ID Map but I dont know what to add. All I need is to add 00 before incoming internation numbers and I don't want to effect local numbers. Can anyone tell me what to add. And my SPA 508G is a standalone phone.