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.
Is this possible?