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Cisco Bug: CSCus19671 - MTP fails to forward this MXFarEndAnswer

Last Modified

Mar 01, 2018

Products (7)

  • Cisco Unified Communications Manager (CallManager)
  • Cisco Intercompany Media Engine
  • Cisco Business Edition 5000 Version 9.1
  • Cisco Unity Connection Version 9.1
  • Cisco Unified Communications Manager Version 9.1
  • Cisco Business Edition 6000 Version 9.1
  • Cisco Unified Communications Manager Session Management Edition

Known Affected Releases

9.1(2) 9.1(2)ES1 9.1(2)ES2

Description (partial)

Call failure. Unable to switch the call back to audio when fax is rejected.

Initial call audio established. MTP is allocated in the call flow due DTMF mismatch.
SIP endpoint A tries to switch to fax, SIP endpoint B rejects fax as it doesn't support it.
SIP endpoint A tries to switch back to audio, call fails.
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Bug Details Include

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  • Status
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