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DTMF issues and problems when using VoIP.
https://www.voipmechanic.com/dtmf-issues.htm#:~:text=Transmission%20carried%20Inband%20DTMF%20is%20only%20considered%20to,is%20generally%20considered%20to%20be%20the%20most%20reliable.
AudioCodes Quick Reference Guide
https://www.audiocodes.com/media/14274/audiocodes-quick-reference-guide-voice-quality-troubleshooting-for-session-border-controllers-sbcs-and-gateways.pdf
AUDIOCODES SHALL NOT BE HELD LIABLE FOR ANY INACCURACIES. Quick Reference Guide From RFC2833 volume: For DTMF digits and other events representable as tones, this field describes the power level of the tone, expressed in dBm0 after dropping the sign. Power levels range from 0 to -63 dBm0. The range of valid DTMF is from 0 to -36 dBm0 (must
AudioCodes MsTeams direct routing: DTMF Event mismatch ...
https://answers.microsoft.com/en-us/msteams/forum/all/audiocodes-msteams-direct-routing-dtmf-event/bbeb6fdd-54f8-4dd9-b492-8badad1729ee
AudioCodes MsTeams direct routing: DTMF Event mismatch. Hi, Currently, MS Teams Direct routing is sending DTMF attribute like this: a=fmtp:101 0-16 Is it possible to have the events changed to: a=fmtp:101 0-15 Thanks. bbeb6fdd-54f8-4dd9-b492-8badad1729ee. 0f447f62-d1a3-468a-9f5c-8398f1d229fc. Louis-Philippe Descamps.
Teams with SBC no DTMF tones - Microsoft Tech …
https://techcommunity.microsoft.com/t5/microsoft-teams/teams-with-sbc-no-dtmf-tones/td-p/726153
a=fmtp:101 0-15 and the SBC should answer. And if you enter DTMF in the teams client, you should receive the DTMF as "inband RTP-data" with the Codec "101". I can see that in my audiocodes Syslogs. Check this and if thats working, then Microsoft is not the problem here.
AudioCodes Enabling Technology Products …
https://www.audiocodes.com/media/2191/smartworks_dt_datasheet.pdf
DTMF/MF Tone Detection DTMF digits: 0 - 9, *, #, A, B, C, D ·MF R2 Digits 15 Digits Forward & Reverse per Q.441 Dynamic range: -38 dBm to 0 dBm ·Minimum tone detection: 40 ms /programmable ·Interdigit timing: 40 ms min. Tone Dialing: Frequency variation less then 1 Hz Rate API Programmable
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