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Cisco Bug: CSCum48921 - 78XX phones send an invalid MoS score of 0 to CUCM

Last Modified

Jul 17, 2018

Products (4)

  • Cisco IP Phone 7800 Series
  • Cisco IP Phone 7841
  • Cisco IP Phone 7821
  • Cisco IP Phone 7861

Known Affected Releases


Description (partial)

78XX series IP Phones send an invalid MoS (Mean Opinion Score) of 0 to Cisco Unified Communications Manager (CUCM).

78XX phones running 10.1.1 will have call information in the SIP BYE, however the data for the MoS contains all zero values.

RTP-RxStat: Dur=3,Pkt=165,Oct=28380,LatePkt=0,LostPkt=0,AvgJit=0,VQMetrics="MLQK=0.0000;MLQKav=0.0000;MLQKmn=0.0000;MLQKmx=0.0000;MLQKvr=0.0;CCR=0.0000;ICR=0.0000;ICRmx=0.0000;CS=0;SCS=0"
RTP-TxStat: Dur=3,Pkt=164,Oct=26240

This is an invalid value according to the ITU-T P.800 specification where the valid range for MoS scores is 1-5.

Related Community Discussions

CMR/CDR Jitter, MOS, Packet Loss, Delay, QOS, Quality Report
Hi, I am looging fot the way of verifying Jitter, MOS, Packet Loss, Delay, QOS for the Cisco IP 78xx sereis phones. For Previous models 79xx series, it was possible to verify the quality of connection in several places: - on the display by pressing "?" twice while on call - on the phone's web site, while on call, by checkig Stream1 properties - in the CMR records Currently I am unable to see this date in any of the locations. When makieng a call between 7821 phone -> 7942 phone, it is not possible ...
Latest activity: Aug 04, 2015
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