This X50 Server comes with XL expansion software pre-installed. The X50 server with XL software supports your choice of up to (6) traditional telephone company lines and/or up to (12) XBLUE certified VoIP telephone lines for a total system capacity of (18) outside telephone lines, and up to (49) X3030 or X4040 IP Phones and (1) Analog “TEL” extension port. Includes 1 year Warranty & 1 Year Technical Support from date of purchase. Product Registration is required at XBLUE.com/registration. Include your Store.XBLUE Order Number when registering.