Part 2: DECT Hardware Installation and Programming36The handset will start searching for your system. When the handset finds asystem, a number will appear in the display. The handset may detect morethan one system (another system nearby); if so, a black triangle will appear inthe bottom of the display.6. Scroll through the numbers in the display by pressing the < or the > key to findyour system’s number. It is important that the number shown in the display isidentical to the number on your system. The number is indicated as an ARI(on the label on the back of the base station).7. When you have selected the correct number, press the OK key and the hand-set will be configured as the Master handset for the system.Now you must allocate an extension number to the handset.1. Press the MENU key and go to EXT SERVICE.2. Press the OK key and go to READ/WRITE USERDATA.3. Press the OK key.The serial number of the Master handset shows in the display.4. Press the OK key.The handset asks for an extension number.5. Enter the extension number. This can be the existing extension number for thecorded phone being paired with the handset, or any number available in thePABX if the handset is being used as the only phone.6. Press the OK key.7. Switch the handset off and on again: the extension number is displayed.Referring to this handset as the ‘Master’ means that you can configure more hand-sets in the system using this handset, as described next.Registering Additional Handsets via the Master HandsetTo register a handset, the Master handset must "allow" you to do so. Each handsetregistered is configured to a channel 01 to 07.1. Press the MENU key and go to EXT SERVICE.2. Press the OK key and go to READ/WRITE USERDATA.3. Press the OK key.