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Cisco Bug: CSCur35598 - Malformed RFC2833 DTMF from IOS voice GW detected as 3 events

Last Modified

Sep 17, 2019

Products (1)

  • Cisco TelePresence Server

Known Affected Releases


Description (partial)

A TelePresence Server may poorly detect badly-formed DTMF digits from some RFC2833 voice gateways and triple count the tones.

Only present in the 1.22 and 1.42 EFT releases of TS 4.1. This requires the sending DTMF device to have set the marker bit for each packet in a given DTMF tone, which is technically incorrect behaviour on the part of the sending device.
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