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Cisco Bug: CSCsz70581 - Security Alarm calls failing due to DSP detection of v21 flag

Last Modified

Feb 04, 2017

Products (29)

  • Cisco IAD2400 Series Integrated Access Devices
  • Cisco IGX 8450 SES Multiservice Switch
  • Cisco IGX 8410 Multiservice Switch
  • Cisco VG224 Analog Voice Gateway
  • Cisco 7206 Router
  • Cisco 7301 Router
  • Cisco 7206VXR Router
  • Cisco MGX 8850 Multiservice Switch
  • Cisco IAD2430 Integrated Access Device
  • Cisco IGX 8400 MPLS Label Switch Router
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Known Affected Releases


Description (partial)


When using t.38 (fax relay), calls to alarm companies fail.  

*  Alarm panel uses a modem to communicate to the alarm company
*  Problem observed using IOS 12.4.11.T3/9.2.3 DSPware
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