The included handset is pre-registered at the factory and assignedthe extension number 1. You do not need to register this handsetwhich has “[1]” on the display.If you purchase optional handsets, you must register each of them at thebase unit. Only one handset can be registered at a time. A handset will beassigned the extension number at registration.The model numbers of the optional handsets are KX-TGA270S,KX-TGA271V, KX-TGA271W and KX-TGA272S. To order, contact yourdealer or call 1-800-211-PANA(7262) to locate a dealer.Make sure the base unit and the other handsets are not being used.Registration must be completed within 1 minute.The handset display shows the instructions asshown on the right.1 Base unit: Press (MUTE).•The MUTE indicator light flashes.2 Handset:#Press the right soft key ( ).$Wait until a long beep sounds and thedisplay shows the registered number.The registration will be then complete.•The registered number “[1]” to “[8]” is shown onthe top right of the display.OKRegistration for Additional Handsets26SP PRIVACY [-]Press MUTE onbase unit, thenOK on handset toregister handsetO KEx. Extension number 2KX-TG2730S Up to 7 optional handsets can be added.•The illustration is KX-TGA270S.SP PRIVACY [-]HandsetRegisteringSP PRIVACY [2]Handset [2]RegisteredKX-TG2730S includes a handset with the base unit. You can expand thesystem by adding up to 7 optional handsets to the system. A maximum of8 handsets can be registered at the base unit.Generally a maximum of 4 extensions excluding or including the base unitcan operate at a time. If 4 other extensions are in use, such as conductingan external/internal call, you may not be able to use your unit. “Systemis busy. Please try again later.” will display when you try tooperate your handset. The maximum operating number may decrease,depending on the state of usage, such as using the Reception Boostermode (p. 29), or when the Answering System is taking a call.