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Cisco Bug: CSCur57934 - 7800 phones stop playing multicast audio (informacast)

Last Modified

Feb 16, 2018

Products (33)

  • Cisco IP Phone 7800 Series
  • Cisco Unified IP Phone 7945G
  • Cisco IP Phone 8851
  • Cisco IP Phone 7841
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified IP Phone 9951
  • Cisco Unified IP Phone 7962G
  • Cisco IP Phone 7821
  • Cisco Unified IP Phone 7941G
  • Cisco Unified IP Phone 7961G-GE
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Known Affected Releases


Description (partial)

7800 phones intermittently stop playing multicast paging audio (Informacast).  The phones appear to be receiving the page fine and speakerphone is enabled, but no sound can be heard.

Packet captures show that the 7800 phones are joining the multicast group and receiving RTP traffic for the audio, just not playing it out the phone speaker.

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Bug Details Include

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