Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 355276)
+++ channels/chan_sip.c	(working copy)
@@ -10353,7 +10353,11 @@
 	snprintf(tmp, sizeof(tmp), "%u %s", seqno, sip_methods[sipmethod].text);
 
 	add_header(req, "Via", p->via);
-	if (p->route) {
+	/*
+	 * Use the learned route set unless this is a CANCEL. For a CANCEL
+	 * we have to send to the same destination as the original INVITE.
+	 */
+	if (p->route && sipmethod != SIP_CANCEL) {
 		set_destination(p, p->route->hop);
 		add_route(req, is_strict ? p->route->next : p->route);
 	}