AT&T MERLIN LEGEND Release 3.0 Programming Summary Manual page 134

Timers and Counters
T308 Timer. Times the delay in network response when the system
sends a release message to clear a call.
T309 Timer. Times the duration of a D-channel data link failure (a loss
of signaling for the entire PRI connection).
T310 Timer. Times the network delay following the receipt of a call
preceding message on an outgoing call.
T313 Timer. Times the delay in network response when the system
sends a connect message that indicates the completion of an
incoming call.
T316 Timer. Times the delay in network response when the system
sends a restart message to clear a B-channel.
NOTE:
If you enter an invalid timer value, the number you enter is truncated to the
closest valid value. For example, if you enter 45 for a counter that ranges from
0 to 30, 4 is recorded as the counter value.
Table 9-1 shows the factory setting for each timer and counter and the valid
range for each threshold.
9-12 PRI Facilities