FIELD: communication system, possible use for routing a message to a temporarily inaccessible network user.
SUBSTANCE: in accordance to the invention, subscription is imitated for network user registration status, if network user is listed as inaccessible. Then notification is generated, when network user registration status changes, to list condition, when network user is accessible again or when network user is registered again, and message is routed to network user in response to receipt of notification.
EFFECT: ensured awareness of subscriber about condition of connection or registration of network user.
4 cl, 4 dwg
