Hi Lubos,
As per the following link
http://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-border-element/112095-cube-hsrp-config-00.html#anc13
Step 6: Configure the Media Inactivity Timer
The Media Inactivity Timer enables the Active/Standby router pair to monitor and disconnect calls if no Real-Time Protocol (RTP) packets are received within a configurable time period.
When RTP packets for a call are not received by the Active/Standby router, the SIP Media Inactivity Timer releases the session. This is used to guard against any hung sessions that might have resulted from the failover in the event that a normal call disconnect does not clear the call.
The same duration for the Media Inactivity Timer should be configured on both routers. The default value is 28 seconds. This timer is configured as follows:
ip rtcp report interval 3000
gateway
media-inactivity-criteria all
timer receive-rtp 86400
timer receive-rtcp 5
Manish
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