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Hearing tones while on a call

Hearing tones while on a call

(OP)
I have Aura ver 6.3 with an SBC with SIP trunks. I have a user who while on a call hears what he describes is someone on the line trying to dial.

RE: Hearing tones while on a call

reproducible? you can get a packet capture on the SBC from the webpage.

Otherwise, maybe recording tones? If not, I've seen some carriers/SIP ATAs that don't do RFC2833 DTMF (out of band) and leave the DTMF as audio in band. Other carriers refuse to have DSPs sniffing, so they never notice and just pass the tones through as is. If you could trace a call and hear the audio with the tones, perhaps you can see if the SDP of that call offer had a telephone-event 8000 or not - that's out of band DTMF. If its not in the SDP, definitely the issue. Even if telephone-event 8000 is there, doesn't mean the other thing 9 SIP proxies away isn't old and only doing in band DTMF.

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