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Cisco Bug: CSCtf06239 - SPA504 locks up on second call with "call-waiting ring" configured

Last Modified

Jan 27, 2017

Products (7)

  • Cisco Small Business SPA500 Series IP Phones
  • Cisco SPA504G 4-Line IP Phone
  • Cisco SPA501G 8-Line IP Phone
  • Cisco SPA502G 1-Line IP Phone
  • Cisco SPA508G 8-Line IP Phone
  • Cisco SPA525G 5-line IP Phone with Color Display
  • Cisco SPA509G 12-Line IP Phone

Known Affected Releases


Description (partial)


A 504 phone configured with a dual-line DN, and 'call-waiting ring' configured, can receive one call.  However, upon receiving a second call, the phone drops the first call, locks up (traceback seen in the log), and has to be reset in order to function.


A 504 phone configured with a dual-line DN, and 'call-waiting ring' configured.  The crash occurs when the second call comes in on a dual-line DN
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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