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Cisco Bug: CSCus84669 - SIP-GW matching busy out dial peer for SIP REFER

Last Modified

Feb 03, 2017

Products (81)

  • Cisco IOS
  • Cisco C892FSP Integrated Services Router
  • Cisco 888W Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 819 Hardened Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco 861W Integrated Services Router
  • Cisco 881SRSTW Integrated Services Router
  • Cisco 2951 Integrated Services Router
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Known Affected Releases


Description (partial)

Dialer -- SIP -- SIP-GW -- PRI (PSTN) 
Dialer -- SIP -- SIP-GW (DP 5001 pref 1) -- SIP -- CUCM (SUB1)
Dialer -- SIP -- SIP-GW(DP 5000 pref 2) -- SIP -- CUCM (SUB2)

Problem Description: 
Both dial peers 5000 and 5001 are configured with SIP Options PING. The issue is when SUB2 is down then SIP-GW marks dial peer 5000 as "busyout" but still SIP-GW sends the call (once REFER is received from Dialer) to SUB2 even though the matched dial peer is 5001 (for SUB1).

IOS version: c3900e-universalk9-mz.SPA.153-3.M4.bin

Call Flow: 
+ Dialer calls a PSTN number via SIP-GW. 
+ PSTN user answers the call. Now Dialer sends a SIP REFER to CUBE with Refer To as "XXXXX". SIP-GW matches an outgoing dial peer and sends the call to CUCM. There are two separate dial peers configured to send outgoing Invite to CUCM. Dial peer 5000 sends call to SUB2  which has preference 2 whereas dial peer 5001 is configured to send call to SUB1 with preference 1.
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