Sets the duration, in milliseconds, of the T306 signaling timer on this port, defaulting to 30000 ms; this is the ITU-T Q.2931 timer used while a call is in the process of being released, before the release is considered to have failed, per ITU-T Q.2931. Admins normally leave signaling timers at their standard defaults, adjusting them only to interoperate with a far-end switch that uses nonstandard timer values or to work around a specific signaling interoperability issue.