Tiptel ISDN Telephone Tiptel 293. Phonebook capacity: 100 entries. Networking standards: EURO-ISDN. Weight: 900 g, Dimensions (WxDxH): 220 x 200 x 90 mm. Compatible operating systems: Windows 3.1x, Windows 95 / 98 / ME / NT 4.0 / 2000 / XP. Operating temperature range (T-T): 0 - 40 °C