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Cisco Bug: CSCvu19773 - Unnecessary MTP insertion for a FAX to FAX call due to EO DTMF mismatch

Last Modified

May 11, 2020

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

11.5(1.13900.70)

Description (partial)

Symptom:
MTP will be inserted due to DTMF mismatch for a EO offer even if peer doesn't support any DTMF methods.

Conditions:
Party A EO ( Phone or Trunk) --> CUCM --> SIP Trunk  --> EO Offer
In the above call flow, even if party A doesn't support any DTMF method, CUCM will insert a MTP due to DTMF mismatch and sends EO offer to party B.
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