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Cisco Bug: CSCua90319 - Call Failure is seen when using Dual Mode Phone with MGCP GW

Last Modified

Feb 25, 2019

Products (8)

  • Cisco Unified Communications Manager (CallManager)
  • Cisco Intercompany Media Engine
  • Cisco Business Edition 5000 Version 8.6
  • Cisco Business Edition 3000 Version 8.6
  • Cisco Unified Communications Manager Version 8.6
  • Cisco Business Edition 6000 Version 8.6
  • Cisco Unity Connection Version 8.6
  • Cisco Unified Communications Manager Session Management Edition

Known Affected Releases


Description (partial)


Calls made from a PSTN number are failing due to the double transformation of
called number happening on CUCM. The transformation is done by prefixing a few
digits (in my customer's case, prefix is 701). 


Call Flow - GW -MGCP-> CUCM -> IP Phone

significant digit must be all or large enough.
Calling device should be dual mode type, such as iphone, android.
Inbound gw has to be MGCP type. 
Admin configured prefix DN on "Call Routing Information ? Inbound Calls"
If ingress UCM MGCP GW configured as user side, problem occur when above 3
items satisfied. If UCM MGCP GW configured as network side,  problem will only
occur if gw type is not Vega or T1 and above 3 items satisfied.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
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