--- asterisk/channels/chan_sip.c.ORIG	2006-01-30 23:08:54.000000000 -0600
+++ asterisk/channels/chan_sip.c	2006-01-31 11:05:33.000000000 -0600
@@ -3163,6 +3163,14 @@
 					found = 0;		/* This is not our packet */
 				}
 			}
+			if (p->theirtag[0] == '\0' && fromtag[0]) {
+				/* We have no from tag, but they have. Wrong dialog */
+				found = 0;
+			} else if (fromtag[0]) {		/* Both have tags, compare them */
+				if (strcmp(fromtag, p->theirtag)) {
+					found = 0;		/* This is not our packet */
+				}
+			}
 			if (!found && option_debug > 4)
 				ast_log(LOG_DEBUG, "= Being pedantic: This is not our match on request: Call ID: %s Ourtag <null> Totag %s Method %s\n", p->callid, totag, sip_methods[req->method].text);
 		}