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Cisco Bug: CSCum80477 - 9971 Phone is NOT compliant with RFC2833

Last Modified

May 04, 2016

Products (1)

  • Cisco Unified IP Phones 9900 Series

Known Affected Releases

9.3(2.10)

Description (partial)

Symptom:
Users are unable to join conference bridge. The call connects, user enters passcode and is validated. Subsequently
enters a leader code but that fails. It says invalid code or less digits.


packet capture taken from phone revealed  that 
1. inter arrival time is very close in terms of 0.001 ms, which is far beyond the packetization period (20ms) .from  RFC2833 we can see NTE dtmf is supposed to be transmitted every packetization period 

2.the NTE dtmf end pkts are very close to each other.From RFC 2833 
The final packet for each event and for each segment SHOULD be sent a
total of three times at the interval used by the source for updates.

Conditions:
Issue is seen on 79xx, 99xx, 69xx  tested with various firmware version including 9.3.2-10,9.4.1 on 9971. issue is present  from day 1
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