Index: chan_sip.c
===================================================================
--- chan_sip.c	(revision 29968)
+++ chan_sip.c	(working copy)
@@ -10660,9 +10660,11 @@
 						if (!strcmp(p->refer_to, ast_parking_ext())) {
 							/* Must release c's lock now, because it will not longer
 							    be accessible after the transfer! */
+						        /* moved unlock to below the call to sip park in defiance
+							   of the comment above. Don't really know if this is safe */
 							*nounlock = 1;
+							sip_park(transfer_to, c, req);
 							ast_mutex_unlock(&c->lock);
-							sip_park(transfer_to, c, req);
 							nobye = 1;
 						} else {
 							/* Must release c's lock now, because it will not longer