Distributed company structures usually provide ISDN connections at branch offices to allow staff local access to the telephone network using appropriate ISDN terminal devices.
- A connection from the local ISDN terminal devices to a SIP PBX at the headquarters can easily be set up using a LANCOM VoIP Router.
- Furthermore, the "Remote Gateway“ function can be used to connect
both the terminal devices and the local ISDN connections to the central
PBX. Benefits of the remote gateway:
- The local ISDN connections are made available to all users in the company network. Calls to the local ISDN network can be made from anywhere as local calls (even from beyond state boundaries).
- All calls, even those made by local users into their "own" telephone network, can be made via the SIP PBX, consequently facilitating central administration and logging.
In this example we'll take a look at a company headquartered in Munich. The branch office in Vienna should be in a position to call the headquarters using the internal numbers. "83“ numbers are taken from the headquarter's number range and are reserved for Vienna for this purpose. The sales and support departments at the company headquarters should also be contactable from Austria as a local, or national long-distance call from Vienna. The purchasing department would also like to be able to contact suppliers in Austria using national long-distance calls.