This page is about extending the contact information regarding ordinary phone numbers.
- incorrect formatting in Evolution/in some contact's "phone number" data will lead to failures when calling (different providers want different number formats, +49... 0049... etc.
Phone number formats seen so far
Just a useless collection, maybe you get a feeling of the problematic.
- +1 800 555 1212
- 0049 30 123456
- 030 123456
assign accounts to country prefixes
assign dial formats to accounts and a "default prefix"
Discussion: There are not much different ways, an international number can be dialed. We could assing such a way to every account. That would make it neccesary to guess/parse the phone number to dial and to convert it to the desired format.
It might also be useful to develop a "phone number description language" for user-defined dialing formats (similar as regular expressions are a "string description language"). The tricky part will be to parse the given phone number. Conversion to a specific format is relatively easy then. Imagine a provider wants to dial an international number like ***123+49-96173387, then the description string might be ***123+P-N (just an example straight out of my head, no idea if that matches the practise, but you get the idea).
Assume E.123/E.164 format
National notation: (042) 123 4567
International notation: +31 42 123 4567
The groups of digits can be separated by hyphens (-), spaces ( ) or dots (.).