diff -d -u -r1.5 chan_sip.c
--- channels/chan_sip.c	6 Aug 2008 11:05:37 -0000	1.5
+++ channels/chan_sip.c	15 Sep 2008 13:48:33 -0000
@@ -797,6 +797,7 @@
 #define SIP_PAGE2_RFC2833_COMPENSATE    (1 << 25)	/*!< 25: ???? */
 #define SIP_PAGE2_BUGGY_MWI		(1 << 26)	/*!< 26: Buggy CISCO MWI fix */
 #define SIP_PAGE2_OUTGOING_CALL         (1 << 27)       /*!< 27: Is this an outgoing call? */
+#define SIP_PAGE2_GOT_OK_FOR_INVITE     (1 << 31)       /*!< 31: Got OK for INVITE? */
 
 #define SIP_PAGE2_FLAGS_TO_COPY \
 	(SIP_PAGE2_ALLOWSUBSCRIBE | SIP_PAGE2_ALLOWOVERLAP | SIP_PAGE2_VIDEOSUPPORT | \
@@ -12276,6 +12298,7 @@
 		}
 
 		if (!ast_test_flag(req, SIP_PKT_IGNORE) && p->owner) {
+			ast_set_flag(&p->flags[1], SIP_PAGE2_GOT_OK_FOR_INVITE);	
 			if (!reinvite) {
 				ast_queue_control(p->owner, AST_CONTROL_ANSWER);
 			} else {	/* RE-invite */
@@ -13773,7 +13796,8 @@
 	}
 
 	/* Check if this is a loop */
-	if (ast_test_flag(&p->flags[0], SIP_OUTGOING) && p->owner && (p->owner->_state != AST_STATE_UP)) {
+	if (ast_test_flag(&p->flags[0], SIP_OUTGOING) && p->owner && (p->owner->_state != AST_STATE_UP)
+	    && !ast_test_flag(&p->flags[1], SIP_PAGE2_GOT_OK_FOR_INVITE)) {
 		/* This is a call to ourself.  Send ourselves an error code and stop
 	   	processing immediately, as SIP really has no good mechanism for
 	   	being able to call yourself */