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Implement T316 to allow RESTART messages to be automatically retransmitted.

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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
This commit is contained in:
Richard Mudgett
2012-06-28 00:16:33 +00:00
parent f78400fc07
commit fffb7babaf
4 changed files with 117 additions and 18 deletions
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8
pri.c
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@@ -81,6 +81,7 @@ static const struct pri_timer_table pri_timer[] = {
{ "T313", PRI_TIMER_T313, PRI_ALL_SWITCHES },
{ "T314", PRI_TIMER_T314, PRI_ALL_SWITCHES },
{ "T316", PRI_TIMER_T316, PRI_ALL_SWITCHES },
{ "N316", PRI_TIMER_N316, PRI_ALL_SWITCHES },
{ "T317", PRI_TIMER_T317, PRI_ALL_SWITCHES },
{ "T318", PRI_TIMER_T318, PRI_ALL_SWITCHES },
{ "T319", PRI_TIMER_T319, PRI_ALL_SWITCHES },
@@ -184,6 +185,10 @@ static void pri_default_timers(struct pri *ctrl, int switchtype)
ctrl->timers[PRI_TIMER_T309] = 6 * 1000; /* Time to wait before clearing calls in case of D-channel transient event. Q.931 specifies 6-90 seconds */
ctrl->timers[PRI_TIMER_T312] = (4 + 2) * 1000;/* Supervise broadcast SETUP message call reference retention. T303 + 2 seconds */
ctrl->timers[PRI_TIMER_T313] = 4 * 1000; /* Wait for CONNECT acknowledge, CPE side only */
#if 0 /* Default disable the T316 timer otherwise the user cannot disable it. */
ctrl->timers[PRI_TIMER_T316] = 2 * 60 * 1000; /* RESTART retransmit timer */
#endif
ctrl->timers[PRI_TIMER_N316] = 2; /* Send RESTART this many times before giving up. */
ctrl->timers[PRI_TIMER_TM20] = 2500; /* Max time awaiting XID response - Q.921 Appendix IV */
ctrl->timers[PRI_TIMER_NM20] = 3; /* Number of XID retransmits - Q.921 Appendix IV */
@@ -1795,7 +1800,8 @@ char *pri_dump_info_str(struct pri *ctrl)
enum PRI_TIMERS_AND_COUNTERS tmr;
tmr = pri_timer[idx].number;
if (0 <= ctrl->timers[tmr]) {
if (0 <= ctrl->timers[tmr]
|| tmr == PRI_TIMER_T316) {
used = pri_snprintf(buf, used, buf_size, " %s: %d\n",
pri_timer[idx].name, ctrl->timers[tmr]);
}