V-Tech DT-IP Technical Guide - Manual (Page 55)

See the following picture, there are 8 position for calling transfer. For example, when one
door station or monitor call Guard Centre, it will call GL 1 firstly, if GL 1 is busy or offline,
the calling will be diverted to GL2, if GL2 is busy or offline, the calling will be diverted to GL
3… Repeat this till divert the calling to the last Guard Centre.
Press the Write to all device button to download the info to all devices connected to the
network, and info will be saved to database at the same time. If only press Save button, the
info just is kept in the database, isn’t downloaded to devices.
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IP-2 wire system technical guide