(closes issue #9660)

Reported by: mmacvicar
Patches submitted by: bbryant, russell
Tested by: mmacvicar, marco, arcivanov, jmhunter, explidous

When using a TDM400P (and probably other analog cards) there was a chance that
you could hang up and pick the phone back up where it has been long enough to
be not considered a flash hook, but too soon such that the device reports that
it is busy and the person on the phone will only hear silence.  This patch
makes chan_zap more tolerant of this and gives the device a couple of seconds 
to succeed so the person on the phone happily gets their dialtone.


git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.2@75052 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 12 insertions, 3 deletions

diff --git a/channels/chan_zap.c b/channels/chan_zap.c
index e66e171db..695684ce8 100644
--- a/channels/chan_zap.c
+++ b/channels/chan_zap.c
@@ -1726,14 +1726,23 @@ static int restore_gains(struct zt_pvt *p)
 
 static inline int zt_set_hook(int fd, int hs)
 {
-	int x, res;
+	int x, res, count = 0;
+
 	x = hs;
 	res = ioctl(fd, ZT_HOOK, &x);
-	if (res < 0) 
-	{
+
+	while (res < 0 && count < 20) {
+		usleep(100000); /* 1/10 sec. */
+		x = hs;
+		res = ioctl(fd, ZT_HOOK, &x);
+		count++;
+	}
+
+	if (res < 0) {
 		if (errno == EINPROGRESS) return 0;
 		ast_log(LOG_WARNING, "zt hook failed: %s\n", strerror(errno));
 	}
+
 	return res;
 }