Have a look at your SIP phones' support for the Alert-Info header (and
Asterisk's support for it, come to that).
I know some hardphone (eg Thomson ST2030) can set ring-tone
according Caller's presence inside phone's directory.
In this case, Asterisk would have to :
- fake original caller-name and set it to "call for Alice",
- replace original caller-id with Alice extension (eg 4111
instead of +44 812 41 54 66)
so that hardphone gets everything it needs to :
- recognize from caller-id that the calls comes from Alice
(though it's a call FOR Alice)
- and then uses Alice ringing tone instead of Bob's tone.
Is this roughly correct ?
How many phones behaves like this ?
As you said, it would be sad to loose SIP portability.
It would be nice to use SIP protocol to drive such behaviour.
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