I have an existing system a fairly old Matra PABX that does not have voicemail.
I want to use Asterisk to equip it.
I will use analog ports for the links between the 2 devices.
I asked myself the question about the notification of the phone of the user.
My PABX works with DTMF Q23. It will be necessary that Asterisk can analyze what the PABX sends, and Asterisk can also send DTMF analyzed by the PABX to notifyor denote the phone for example.
In what way does Q.23 (not Q23) differ from MF4? As far as I can tell, given the poor scan of the image, from http://www.itu.int/rec/dologin_pub.asp?id=T-REC-Q.23-198811-I!!PDF-E&lang=e&type=items , it uses the exact same frequencies, and the Wikipedia article for DTMF quotes the Q.23 specification as one of its sources.
Effectively I had the impression that it was a different operation, error on my part. However, asterisk can send a DTMF on the analog channel when a message on the voice mailbox?