[asterisk-users] question about astdb

[Rilawich Ango]

I noticed that asterisk will keep the phone record in astdb when the
phone (especially hardphone) unplugged.

After unplug the phone, I still get the phone information in astdb:
>database showkey SIP/Registry/1234
>/SIP/Registry/1234                          :
10.14.43.31:40876:60:1234:sip:1234 at 10.14.43.31:40876;rinstance=09d900e954f2e92d

I wonder whether asterisk will have a mechanism to check and remove
the account without register message after period of time?