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Cisco Bug: CSCul89998 - Increase SCCP Application stack to 24000 to avoid low stack crashes

Last Modified

Apr 17, 2019

Products (74)

  • Cisco IOS
  • Cisco 892W Integrated Services Router
  • Cisco 881SRSTW Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 819 Hardened Integrated Services Router
  • Cisco C897VA Integrated Services Router
  • Cisco 861W Integrated Services Router
  • Cisco 812 CiFi Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
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Known Affected Releases


Description (partial)

c3900 as RSVP agent crashed "%SYS-6-STACKLOW: Stack for process SCCP Application running low, 0/12000"

IOS Image: 153-3.M1
CUCM Image:

C3900 router configured as RSVP-Agent  for CUCM feature e2eRSVP crashed under extended traffic load (3+ days). The traffic was running at a rate of 250 concurrent RSVP sessions. 


Phone-A----------(Cluster-1)----------- SIP Trunk ------------(Cluster-2)--------Phone-B
       |                             |                                                                   |                           |
       |                            sccp                                                            sccp                       |
       |                             |                                                                   |                           |
        RTP------------(RSVP-Agent1)---------- IP/RSVP---------(RSVP-Agent-2)---- rtp
Cluster-1 CUCM controls  rsvp-agent-1  [c3800]
Cluster-2 CUCM controls  rsvp-agent-2  [c3900]
--> Calls are made between Cluster-1 and Cluster-2 in both directions.

Type of calls:  Basic, and supplementary Services (Hold-resume, Transfers, Conferences)
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