We are running a asterisk IVR system controlled by dtmf
Every “normal” provider uses rfc2833 to transmit keystrokes which works fine
“Deutsche Telekom” in germany introduced some time ago so called ALL-IP product. This meanes Telekom switches to VOIP
Problem is that asterisk does not recognize dtmf keystrokes. Reason seams to be, that telekom does signal rfc2833 but sends keystrokes only as DTMF-inband
FreeSwitch seems to have a feature called “spandsp_start_dtmf”. Using this FreeSwitch can (not tested) recognize rfc2833 and inband in parallel.
Is there some solution for asterisk?
I tried sip and pjsip (with 13.9.1) but inband is not recognized.