Index: chan_iax2.c
===================================================================
--- chan_iax2.c	(revision 103738)
+++ chan_iax2.c	(working copy)
@@ -3112,8 +3150,12 @@
 		return -1;
 	}
 
-	if (!pds.exten)
-		pds.exten = defaultrdest;
+	if (!pds.exten) {
+		if (!ast_strlen_zero(c->exten))
+			pds.exten = c->exten;
+		else
+			pds.exten = defaultrdest;
+	}
 
 	if (create_addr(pds.peer, c, &sin, &cai)) {
 		ast_log(LOG_WARNING, "No address associated with '%s'\n", pds.peer);