move callstate changes down to take place after the core states have run

src/switch_core_state_machine.c

@@ -684,6 +684,7 @@ SWITCH_DECLARE(void) switch_core_session_hangup_state(switch_core_session_t *ses
 		api_hook(session, hook_var, use_session);
 	}
 
+	switch_channel_set_callstate(session->channel, CCS_HANGUP);
 	switch_set_flag(session, SSF_HANGUP);
 
 }