Implement T316 to allow RESTART messages to be automatically retransmitted.
Q.931 defines the T316 timer to retransmit RESTART messages if a RESTART ACKNOWLEDGE message is not received before the timer expires. Q.931 defaults the time of T316 to 2 minutes with the default number of consecutive RESTART failures as two. * To support legacy behavior, the T316 timer is disabled by default. It is also disabled because the user cannot configure it to disabled if it is enabled. * The N316 count is created to allow the number of RESTART attempts to be configurable. Note you will need to recompile Asterisk to be able to configure N316. (issue ASTERISK-19608) (issue AST-815) (closes issue PRI-133) Reported by: Mike Boylan Tested by: rmudgett git-svn-id: https://origsvn.digium.com/svn/libpri/branches/1.4@2288 2fbb986a-6c06-0410-b554-c9c1f0a7f128
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