--- channels/chan_sip.c	(revision 10625)
+++ channels/chan_sip.c	(working copy)
@@ -3323,8 +3323,8 @@
 
 		if (found) {
 			/* Found the call */
+			ast_mutex_unlock(&iflock);
 			ast_mutex_lock(&p->lock);
-			ast_mutex_unlock(&iflock);
 			return p;
 		}
 		p = p->next;