diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index d10bc5a005..d474ec2973 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -10794,17 +10794,13 @@ static int get_destination(struct sip_pvt *p, struct sip_request *oreq)
 	return -1;
 }
 
-/*! \brief Lock dialog lock and find matching pvt lock  
-	- Their tag is fromtag, our tag is to-tag
-	- This means that in some transactions, totag needs to be their tag :-)
-	  depending upon the direction
+/*! \brief Lock dialog lock and find matching pvt lock
 	Returns a reference, remember to release it when done XXX
 */
 static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag) 
 {
 	struct sip_pvt *sip_pvt_ptr;
 
-
 	if (totag)
 		ast_debug(4, "Looking for callid %s (fromtag %s totag %s)\n", callid, fromtag ? fromtag : "<no fromtag>", totag ? totag : "<no totag>");
 
@@ -10813,7 +10809,6 @@ static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *t
 	for (sip_pvt_ptr = dialoglist; sip_pvt_ptr; sip_pvt_ptr = sip_pvt_ptr->next) {
 		if (!strcmp(sip_pvt_ptr->callid, callid)) {
 			int match = 1;
-			char *ourtag = sip_pvt_ptr->tag;
 
 			/* Go ahead and lock it (and its owner) before returning */
 			sip_pvt_lock(sip_pvt_ptr);
@@ -10822,8 +10817,21 @@ static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *t
 			   (With a forking SIP proxy, several call legs share the
 			   call id, but have different tags)
 			*/
-			if (pedanticsipchecking && (strcmp(fromtag, sip_pvt_ptr->theirtag) || (!ast_strlen_zero(totag) && strcmp(totag, ourtag))))
-				match = 0;
+			if (pedanticsipchecking) {
+				const char *pvt_fromtag, *pvt_totag;
+
+				if (sip_pvt_ptr->outgoing_call == TRUE) {
+					/* Outgoing call tags : from is "our", to is "their" */
+					pvt_fromtag = sip_pvt_ptr->tag ;
+					pvt_totag = sip_pvt_ptr->theirtag ;
+				} else {
+					/* Incoming call tags : from is "their", to is "our" */
+					pvt_fromtag = sip_pvt_ptr->theirtag ;
+					pvt_totag = sip_pvt_ptr->tag ;
+				}
+				if (ast_strlen_zero(fromtag) || strcmp(fromtag, pvt_fromtag) || (!ast_strlen_zero(totag) && strcmp(totag, pvt_totag)))
+					match = 0;
+			}
 
 			if (!match) {
 				sip_pvt_unlock(sip_pvt_ptr);
@@ -10832,7 +10840,7 @@ static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *t
 
 			if (totag)				 
 				ast_debug(4, "Matched %s call - their tag is %s Our tag is %s\n",
-					ast_test_flag(&sip_pvt_ptr->flags[0], SIP_OUTGOING) ? "OUTGOING": "INCOMING",
+					sip_pvt_ptr->outgoing_call == TRUE ? "OUTGOING": "INCOMING",
 					sip_pvt_ptr->theirtag, sip_pvt_ptr->tag);
 
 			/* deadlock avoidance... */