User registration

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.