[Freeswitch-users] Unregistering Phones When FS Is Manually Shut Down

I noticed that FS does not send REGISTER expires 0 messages to registered endpoints when the Freeswitch process is shutdown for occasional maintenance. However, I did notice it sends SUBSCRIBE expires 0 to all presence subscribers. Is there a flag to cause it to send the REGISTER expires 0 in this case? Best Regards, Jerry