Index: pbx/pbx_spool.c
===================================================================
--- pbx/pbx_spool.c	(revision 143404)
+++ pbx/pbx_spool.c	(working copy)
@@ -101,6 +101,9 @@
 
 static void free_outgoing(struct outgoing *o)
 {
+	if (o->vars) {
+		ast_variables_destroy(o->vars);
+	}
 	ast_free(o);
 }
 
@@ -324,9 +327,11 @@
 	if (!ast_strlen_zero(o->app)) {
 		ast_verb(3, "Attempting call on %s/%s for application %s(%s) (Retry %d)\n", o->tech, o->dest, o->app, o->data, o->retries);
 		res = ast_pbx_outgoing_app(o->tech, o->format, o->dest, o->waittime * 1000, o->app, o->data, &reason, 2 /* wait to finish */, o->cid_num, o->cid_name, o->vars, o->account, NULL);
+		o->vars = NULL;
 	} else {
 		ast_verb(3, "Attempting call on %s/%s for %s@%s:%d (Retry %d)\n", o->tech, o->dest, o->exten, o->context,o->priority, o->retries);
 		res = ast_pbx_outgoing_exten(o->tech, o->format, o->dest, o->waittime * 1000, o->context, o->exten, o->priority, &reason, 2 /* wait to finish */, o->cid_num, o->cid_name, o->vars, o->account, NULL);
+		o->vars = NULL;
 	}
 	if (res) {
 		ast_log(LOG_NOTICE, "Call failed to go through, reason (%d) %s\n", reason, ast_channel_reason2str(reason));
Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 143404)
+++ channels/chan_sip.c	(working copy)
@@ -5666,6 +5666,8 @@
 	/* Set channel variables for this call from configuration */
 	for (v = i->chanvars ; v ; v = v->next)
 		pbx_builtin_setvar_helper(tmp, v->name, v->value);
+	ast_variables_destroy(i->chanvars);
+	i->chanvars = NULL;
 
 	if (state != AST_STATE_DOWN && ast_pbx_start(tmp)) {
 		ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);