The EXP40 expansion module for the SIP-T46S, SIP-T46G, SIP-T48S and SIP-T48G takes your SIP phone’s functional capacity to a new level. It features a large graphical LCD screen. Two pages of 20 flexible buttons are shown on screen and can be programmed. Up to 40 different functions are available, including BLF / BLA, speed dial, call forwarding, transfer, parking, pickup and more.