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Appendix J: DECT Messaging and Location
DECT Messaging and Location Service (DMLS) is a software implementing an open interface that allows
third party applications to communicate with SIP DECT system (DAP Controller PC) through TCP/IP
sockets.
DMLS supports:
• getting general information about handset status
• sending normal and urgent messages to handsets and broadcast groups
• location detection (requires an external application or applications to process and display the
resulting information; for example, from Ekahau)
The following are Location Detection characteristics:
• Detects the position of the handset accurately, within 3 to 5 meters, in best-case scenario.
• When requested by the DMLS, the handset sends back the signal strength information of three
DAPs.
• The handset must see at least three DAPs, rather than one or two. That results in a higher number
of DAPs compared to a system without Location Detection.
• Approximately 50% more Access Points are necessary, compared to a typical SIP DECT system
deployment without Accurate Location Detection.
• The Ekahau Positioning Engine (part of the RTLS software from Ekahau) processes the location
information from the handset to determine the position of the handset. (The EPE contains pre-
recorded location information from the Ekahau Site Survey.)
• The Ekahau Vision tool displays the handset position on a map of the building.
• If the handset moves from one floor to another, Ekahau Vision switches automatically to the map of
the floor where the handset is.
Installation
Installation guide is available as a part of DMLS and Ekahau software packages.
SIP DECT Fundamentals
Service
October 2012
267
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