The Nortel Norstar M7310 is a full-featured telephone designed for users with more extensive calling and call handling requirements. 10 programmable line/feature buttons 12 dual-function memory buttons provide quick access to 24 additional features or auto-dials 2-line by 16-character LCD display with softkeys Can be expanded with Norstar Busy Lamp Field (BLF) The Nortel Norstar M7310 telephone is compatible with all releases of Norstar CICS and MICS Also compatible with IP Office and IP Office Quick Version equipped with IP500 TCM 8, IP500 Digital Station 16A, or IP500 Digital Station 30A