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Cisco Bug: CSCua80477 - Phone sends 400 Bad Request in call recording scenario

Last Modified

Dec 13, 2018

Products (37)

  • Cisco Unified IP Phones 9900 Series
  • Cisco Unified IP Phone Expansion Module 7914
  • Cisco Unified IP Phone 9951
  • Cisco Unified Wireless IP Phone 7920
  • Cisco Unified SIP Phone 3905
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified IP Phone 7962G
  • Cisco Unified IP Phone 7945G
  • Cisco Unified IP Phone 6941
  • Cisco Unified IP Phone 7961G-GE
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Known Affected Releases


Description (partial)


 9951 Phones 9-2-2-SR1-9
 Using Active Voice Recording

Also, intermittently seen on 8961 SIP phones

When a call establishes, CUCM starts the process to contact the Recording Server in order to record the call. In this process CUCM sends two INVITEs almost immediately ( 1 to 4 millisec ) to the Phone in order to instruct it to send the two RTP streams to the Recording Server. The phone fails to parse the second INVITE. Sometimes it fails to parse the Request URI, the FROM, the TO and even the Via Header; however in the phone debugs is observed that the INVITE was correct.

Recording is enabled.
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