From 6304c09149839259713c97c87cb06db74d2b530e Mon Sep 17 00:00:00 2001
From: Joshua Colp <jcolp@digium.com>
Date: Tue, 10 Feb 2009 20:15:43 +0000
Subject: Only decrease inringing count if above zero. (issue #13238) Reported
 by: kowalma

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@174710 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
 channels/chan_sip.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'channels')

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index d932dff05..bfbdba385 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -5314,7 +5314,9 @@ static int update_call_counter(struct sip_pvt *fup, int event)
 			sip_pvt_lock(fup);
 			ao2_lock(p);
 			if (ast_test_flag(&fup->flags[0], SIP_INC_RINGING)) {
-				(*inringing)--;
+				if (*inringing > 0) {
+					(*inringing)--;
+				}
 				ast_clear_flag(&fup->flags[0], SIP_INC_RINGING);
 			}
 			ao2_unlock(p);
-- 
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