View active registrations (live calls):
- Username: Username of the user (associated password isn't shown here).
- IP: Current IP.
- Protocol: Protocol used for registration.
- NAT: Indicates that far-end Network Address Translation (NAT) traversal (aka Firewall) has modified the entry.
- TTL: Time to live (TTL) is the time since request came in.
- Last Modified: The time of the last state change for the call.
- User Agent: The end device used by the Username above.