Specifications: 2 co. Lines: Each extension phone can receive and make calls from 2 telephone numbers.8 extensions: Any incoming call can be received from one of the 8 extensions. Auto attendant: Automatically receive incoming calls by disa with on/off switch. Auto line seizing: Automatically can for co line. Call jump: Calls transfer to extensions when power failure. Call transfer: Transfer incoming calls to any extension. Call pick up: Can receive any extension calls from any other extensions. Call parking: Can receive other incoming call by parking current call. Hold on music: Play music to caller. Hold reminder: Remind you the holding call periodically.3-party conference: Allow 3 party conference call(2incoming call with one extension, or 2 extension with 1 incoming call ). Ringer on/off(donot disturb ): Can set ringer on/off for each