Cisco Cisco IOS Software Release 12.2(8)T
SIP Media Inactivity Timer
Feature Overview
2
Cisco IOS Release 12.2(8)T and 12.2(11)T
Feature Overview
The SIP Media Inactivity Timer feature enables Cisco gateways to monitor and disconnect Voice-over-IP
(VoIP) calls if no Real-Time Control Protocol (RTCP) packets are received within a configurable time
period.
(VoIP) calls if no Real-Time Control Protocol (RTCP) packets are received within a configurable time
period.
When RTCP reports are not received by a Cisco gateway, the SIP Media Inactivity Timer feature releases
the hung session and its network resources in an orderly manner. These network resources include the
gateway digital signal processor (DSP) and time-division multiplexing (TDM) channel resources that are
utilized by the hung sessions. Because call signaling is sent to tear down the call, any stateful SIP proxies
involved in the call are also notified to clear the state that they have associated with the hung session.
The call is also cleared back through the TDM port so that any attached TDM switching equipment also
clears its resources.
the hung session and its network resources in an orderly manner. These network resources include the
gateway digital signal processor (DSP) and time-division multiplexing (TDM) channel resources that are
utilized by the hung sessions. Because call signaling is sent to tear down the call, any stateful SIP proxies
involved in the call are also notified to clear the state that they have associated with the hung session.
The call is also cleared back through the TDM port so that any attached TDM switching equipment also
clears its resources.
Benefits
Provides a mechanism for detecting and freeing hung network resources when no RTCP packets are
received by the gateway.
received by the gateway.
Related Features and Technologies
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Cisco VoIP
Related Documents
The following documents contain information related to the Cisco SIP functionality:
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•
Cisco IOS Voice, Video, and Fax Command Reference
, Release 12.2
Supported Platforms
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Cisco 2600 series
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Cisco 3600 series
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Cisco 7200 series
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Cisco AS5300
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Cisco AS5350
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Cisco AS5400
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Cisco AS5850