XBlue X16 Small Office Phone System 6 Line Digital Speakerphone - Red Mahogany (XB1670-76) This XBLUE X16 Phone Only Operates when Connected to an X16 Phone System Server The X16 Server Supports up to (16) X16 phones and (6) Outside Phone Lines X16 Phones Include (6) Dedicated Outside Phone Line Buttons that makes Placing and Retrieving Calls from Hold as Simple as just Pushing a Button In Addition, (12) Programmable Buttons may be used for One-Touch Access to Other Phones, System Features or Speed Dial Paging & Call Announce Intercom with Hands-Free Reply Improves & Streamlines Internal Calling