IP Extensions

For IP extensions, it is important to consider the possible user scenarios as e.g. the configuration files in the terminals will have to be able to find both old and new systems if users are roaming and try to log on to any physical IP telephone.

For H.323 and SIP terminals, the configuration files must be updated when a user moves, i.e. complete domains need to be moved together. Roaming between terminals can only be achieved if the terminal’s configuration file directs the log-on request to the system where the user is active.

As an alternative, users needing roaming can be left initiated in both systems if the call list (Personal Number list) is edited to include own terminal prefixed with the route access code for the interconnecting tie-line.