The Sangoma Expansion Module EXP100 was made for individuals who manage high call volumes. The Sangoma EXP100 Expansion Module is compatible with the Sangoma S505 and S705 IP Phones. Featuring a large 160x320 graphic LCD display with 2 pages of 20 programmable hard keys delivering up to 40 programmable features. For a broader reach and up to 240 programmable keys daisy chain up to 6 expansion modules.