Check the listing for details. sharing phone Line, LSD-2 Smart Phone Line Sharing Device, Switching Capability. Color: White, Condition: New. Listed at 99.98 USD. LSD-2 Smart Line Sharing Device w/ Inbound Switching Capability. LSD-2 is A Smart Line Sharing Device with Inbound Switching Capability. Why pay for a dedicated line for your elevator/emergency phone or alarm panel? The LSD-2 Line Sharing Device allows the user to share an existing phone line with an emergency phone or other priority alarm device. This can save hundreds of dollars a year over leasing a dedicated phone line. The LSD-2 can be used on any C.O. line or analog PABX/KSU station. An outbound call on the DEVICE 2 (PRIORITY) port takes priority over a call in progress on the DEVICE 1 port. Any call in progress on the DEVICE 1 port will be disconnected for 2 seconds, returning dial tone to the DEVICE 2 (PRIORITY) port. A busy signal is then sent to the DEVICE 1 port. For incoming calls, the LSD-2 can route calls to the DEVICE 2 (PRIORITY) port using Caller ID, Distinctive Ring, or Quick Call Back. All other calls will be routed to the DEVICE 1. Alternatively, the LSD- 2 can be set up so that all inbound calls are routed to the DEVICE 2 (PRIORITY) port. Note: Caller ID is not passed through the LSD-2 to the devices. Features: • Adjustable disconnect time • Routes both incoming and outgoing calls • Allows an Emergency device to share a phone line with other devices (fax machines, phones, modems) • Gives priority to the Emergency devices • Incoming calls routed to one of two ports by Caller ID, Distinctive Ring or Quick Call Back • Status LED displays mode of operation • Can store up to 12 Caller ID numbers • Provides a busy signal to the phone port when an Emergency device is in use Applications: Share an existing phone line with an emergency device such as: • Emergency phones • Area of refuge phones • Alarm panels • ATM's • Card readers • Any device that needs instant access to a phone line [ Optional : Touchless-Buttons , ***.TouchLess-Buttons.com ]. Important: When the emergency device is in use, the phone line is not available for normal use. Any additional emergency calls will have to be made on another phone line. For this reason the LSD-2 is not recommended for single line applications. Note: With some Central Office equipment, it may take up to 20 seconds to disconnect an incoming call to the non-priority device. The emergency device must be capable of delaying this long before dialing.