Distinctive ringtone internal, external and transfer

Hi everyone.

I would like to know if it’s possible to have distinctive ringtone for transfered call.
I’m able to set distinctive ringtone for internal and external.

A external call are coming, phone A and B ring.
Phone A anwser and transfer call to phone B
Phone B currently ring with the same ringtone of external call, but a want a distinctive ringtone

Someone can help me ?

What technology are the phones and how do you do the transfers?

For real SIP attended transfers, asterisk does not know that the first step of a transfer is being attempted; only the phone knows that.

Hi, I forgot some information !

I use Trixbox 2.8 (Asterisk 1.6.0.26) with Snom 870 phone

At the moment, I have modified dialparties.agi script.
I change the alert-info. I got the wanted result.
Don’t know if it’s the best way, but it work.

If you have another solution, I will check it.

Modification done to dialparties.agi, near line 167, just after a switch block :

if ($alertinfo && $rgmethod == 'none') { $alertinfo = 'YOUR ALERT-INFO TEXT'; debug("CHANGE Alert-Info: $alertinfo", 4); $AGI->set_alertinfo($alertinfo); }