Phone number formatting

A phone number which is sent from the phone system to the PC has to be formatted accordingly before further processing. The server always uses Super-canonical phone numbers.

The phone number is formatted in this order:

1. Formatting
   All digits apart from + * # 0 1 2 3 4 5 6 7 8 9 are removed.
2. Application of the formatting rules
   The rules of the Formatting rules are applied. For further processing, the modified (if necessary) phone number is used.
3. Removal of the external dialing code
   External dialing codes are removed if present. If an external dialing code is found the phone number is treated as an external number.
4. Recognition of internal numbers
   Provided that no dialing prefix was removed, it is decided by the length and rules for internal phone numbers whether it is an internal phone number.
   • Detection of Special External Phone Numbers, when the phone number is external
   • Phone numbers in the DDI Phone Number Range, when the phone number is internal
   • Detection of Special Internal Phone Numbers, when the phone number is internal (the phone number may have been modified)
   • Detection of Phone Numbers from Other Locations, when the phone number is internal (phone number will be given the appropriate long distance dialing codes).
   • If the length of the phone number corresponds to the specifications for an Internal Phone Number, when the phone number is internal
   • Phone number is external
5. Removal of call-by-call dialing codes (only outgoing phone numbers)
   Existing CallbyCall prefixes are removed for outgoing phone calls. The used prefixes are saved in a Configuration file providers.xml.
6. Standardization of the number
   The phone number is now converted in a super-canonical phone number.