Hi, have been scratching my head over a wired issue that I encountered recently
OS - CentOS6
Using sangoma cards A104 & A108 connected to PRI Lines
Issue - When a caller from a GSM network calls the DID he is presented with an IVR in which he/she can choose from 1-6 options which is presented by the IVR
Now when I check the asterisk logs, I spot that the Asterisk is detecting DTMF inputs like DTMF:A, DTMF:A12, DTMF:A155
Though in my research I found that DTMF inputs can be A,B,C,D along with normal inputs 1-9,0,*,#.
Now since the call is from a GSM network a user does not have the option of DTMF inputs A,B,C,D in a GSM phone. Then how the asterisk is detecting such inputs?
Also the weird DTMF inputs will always be DTMF:A not B,C&D.
Because of these weird DTMF inputs the system detects and invalid key pressed and the call is failed.
Please help me with this issue or at least point me in the right direction.
Can this be a operator related issue which I doubt.?