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Cisco Bug: CSCut30586 - Not processing SIP UDP msgs while sending REGISTER to CUCM in SRST mode

Last Modified

Mar 05, 2018

Products (33)

  • Cisco IP Phone 7800 Series
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified IP Phone 7945G
  • Cisco Unified IP Phone 9951
  • Cisco IP Phone 8851
  • Cisco IP Phone 7841
  • Cisco Unified IP Phone 7962G
  • Cisco IP Phone 7821
  • Cisco Unified IP Phone 6961
  • Cisco Unified IP Phone 7941G
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Known Affected Releases


Description (partial)

CP-78xx can't  process SIP UDP messages while sending retransmission of REGISTER to CUCM in SRST mode.

That causes the following problem.
- The ringing is delayed when CP-78xx receives an INVITE from SRST router.
- The 200 OK is not sent immediately when CP-78xx off-hook.

This issue  is observed when CP-78xx is in SRST mode.
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  • Status
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