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Tech Stuff - ISDN Timers

The following timers are defined by the ITU for use with ISDN.

Name Started Stopped Value Notes
T301 ALERT CONNECT - -
T302 SETUP SETUP_ACK - Overlapped sending only
T303 SETUP CALL_PROC - -
T304 SETUP SETUP_ACK - -
T305 DISC RELEASE - -
T306 - - - -
T308 RELEASE REL_COM - -
T309 - - - How long to keep B channels when D channel goes down.
T310 CALL_PROC ALERT/CONNECT - -
T314 - - - Segmentation
T316 RESTART RESTART_ACK/REJ - -
T317 - - - -
T318 RESUME RESUME_ACK/REJ - -
T319 SUSPEND SUSPEND_ACK/REJ - -
T321 - - - D channel failure to restart attempts
T316 STATUS DISC/REL/REL_COM - -


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