User guide

E.164 conversion 165
Tele phon y
Telephony
E.164 conversion
The Forum 523/524 communications system supports two differ-
ent types of call numbers when dialling external call numbers.
Usually you enter the code for a route, e. g. a “0” for the “external
line” route. Then you enter an external call number. The external
call number can be either a local area code or a country area
code.
The additionally configurable “E.164 conversion” feature enables
you to enter the entire international call number. Using the inter-
national call number makes sense in the following applications:
z When using the “Fixed Mobile Conversion” (FMC) feature as
the call number is usually dialled from the local directory of the
mobile telephone being used.
z When dialling via a computer programme connected with TAPI
where call numbers are often already in the international
format due to synchronisation with a mobile telephone.
z When importing or comparing directory data when directory
entries are in the international format.
z When networking communications systems with locations in
different local areas or in different countries.
The “E.164 conversion” analyses an international call number. The
analysis divides the call number into multiple parts: the interna-
tional area code, the local area code, the access call number and if
necessary the extension. The call number is respectively abbrevi-
ated, eliminating any unnecessary area codes. The abbreviated
call number is then used, e. g. to execute a call.