So I made the mistake of buying a Carrier Access channel bank without noticing the page on the wiki about the fact that they don't support disconnect supervision (bastards!). However, apart from that, I do have it working fine for incoming calls.
Is there some trick to get asterisk to detect the hangup tones from SBC? I've tried busydetect and callprogress as suggested, but neither seems to work. The tone is not a busy tone, but that ear-piercing high pitched buzzer. It goes "if you'd like to make a call, please hang up and try again. If you need help, hang up and then dial your operator. BEEP BEEP BEEP etc."
I am set up here with recording gear and spectrum analyzer software, so I can identify the tones and timing if necessary. However I'm not sure how to make asterisk detect the tones, or if this work has already been done. Anyone know?
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