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Cisco Bug: CSCvs83378 - DTMF FMTP parameter in offer is not relayed same during answer

Last Modified

Feb 27, 2020

Products (1)

  • Cisco IOS

Known Affected Releases

16.9.4

Description (partial)

Symptom:
CUBE is changing the DTMF ?fmtp? parameter while proxying the SIP message to 0 - 36.

CUBE receives an SDP for DTMF like "a=fmtp:101 0-15,32,36" and cube converts the fmtp as "a=fmtp:101 0-36" and sends it as an answer considering the least and higher integer with the hyphen.

Conditions:
This behavior is seen from 16.3.X onward
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