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Cisco Bug: CSCup67150 - CUBE Options-Keepalive with DNS SRV incorrectly set dial-peer to busyout

Last Modified

Feb 15, 2018

Products (96)

  • Cisco IOS
  • Cisco 888W Integrated Services Router
  • Cisco VG224 Analog Voice Gateway
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco VG204 Analog Voice Gateway
  • Cisco 1812 Integrated Services Router
  • Cisco AS5400XM Universal Gateway
  • Cisco 861W Integrated Services Router
  • Cisco 878 Integrated Services Router
  • Cisco 1803 Integrated Services Router
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Known Affected Releases

15.0(1)M 15.1(1)T 15.2(1)T 15.2(2)T 15.2(3)T

Description (partial)

A dial-peer may be set to a "busyout" state incorrectly even when there is a valid response to the SIP OPTIONS message. This is seen in the 'show dial-peer voice summary' command output.

A dial-peer with the "voice-class sip options-keepalive" command configured and using a DNS SRV defined hostname in the "session target" command. When one of the entries resolved replies to the SIP OPTIONS message with a 503/500 or does not respond and the other replies with 200 OK. 

All IOS versions with the 'options-keepalive' feature are impacted. Starting with 15.0(1)M and up to the latest current IOS release (15.4(2)T). 


ip host <Server1_IP>
ip host <Server2_IP>
ip host srv 10 50 5060
ip host srv 10 50 5060

dial-peer voice 1 voip
 preference 1
 destination-pattern .T
 session protocol sipv2
 session target
 session transport tcp
 voice-class sip options-keepalive up-interval 180 down-interval 60
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