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Cisco Bug: CSCuw23085 - Can't handle SUBSCRIBE if arrived between KeepAlive Register and 200 OK

Last Modified

Jul 17, 2018

Products (38)

  • Cisco IP Phone 8800 Series
  • Cisco Unified IP Phone 9951
  • Cisco IP Phone 8865
  • Cisco IP Phone 7841
  • Cisco IP Phone 8851
  • Cisco Unified IP Phone 7962G
  • Cisco Unified SIP Phone 3905
  • Cisco Unified IP Phone 7945G
  • Cisco Unified IP Phone 7911G
  • Cisco Unified IP Phone 7941G
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Known Affected Releases

10.3(1) 11.0(1)

Description (partial)

Offhook dial fail because phone responds "500 Internal Server Error" to KPML SUBSCRIBE.

If the SIP message arrives at phone between phone sending Keep-Alive SIP REGISTER message and receiving the 200 OK response, phone can't handle it, this will make the basic call failed.

In enterprise mode, this is not a big issue as the interval between keep-alive REGISTER and 200 OK is short,
But in CE/Huron mode, the interval will be longer (usually 20-30ms), or even longer according to network condition, so the possibility for this issue to happen is bigger.
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