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Cisco Bug: CSCun84620 - VoLTE call drops after ICSR switchover

Last Modified

Dec 26, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases


Description (partial)

VoLTE call drops after a ICSR switchover in some cases.  There were three bearers present for the IMSI that was being tested and after the switchover, in most cases all three bearers were seen to migrate to the standby chassis but the call dropped.  We assumed the call dropped because of "RTP" timer expiring due to network convergence after the switchover and were looking for engineering analysis on this as well.

VoLTE call should be established between 2 UEs and a "mon sub" to be running on both the IMSIs.  A standby ICSR chassis should be present and the SRP status should be "active".   SRP switchover should be initiated from the active chassis and the same IMSIs should be monitored on the newly active chassis.
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