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TIA TR-41.4 Status, LLDP-MED & ECS ANSI/TIA-1057, Link Layer Discovery Protocol for Media Endpoint Devices (LLDP-MED) Provides VoIP extensions to IEEE 802.1AB LLDP, including endpoint location (and lots more) Published April 2006 No currently active project in TR-41.4 TSB-146-A, IP Telephony Support for Emergency Calling Service (2nd revision) Provides informational overview and possible usages of relevant technologies for device location and other ECS needs, including LLDP-MED, DHCP-based, SNMP-based, WLAN scenarios Publication pending TR-41.4 liaison with NENA Responding to NENA requirements TRs (in progress) ? almost all NENA location requirements well met by LLDP-MED, some cannot be realistically met by any location method Possible LLDP-MED extensions talked about (not committed to) Ability to support location by reference and/or delivery of PIDF-LO objects directly Ability to indicate location determination method used (manual, GPS, triangulated, etc) Ability to indicate ECS call in progress Possible relay/forwarding mechanisms to provide end device with LLDP-MED location, independent of the access network mechanism in use (could be DHCP, L7 LCP, network-specific / proprietary …) Support for device-specific location in WLAN environments (note: LLDP-MED supports AP-specific location today) |