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Layer2/Port Level Discovery
Layer2/Port Level Discovery enables a more granular location strategy.
Each port
on a layer 2 voice/data switch can have its own location (ERL) and its own emergency
number (ELIN). Phones can move from port to port and their location can be automatically
“discovered”. The diagram below shows how Layer2/Port Level Discovery works.
Each port on each switch is assigned a location (ERL – Emergency Response Location)
and an ELIN (Emergency Line Information Number). These ERLs and ELINs are loaded
into E911 Manager™. When a phone plugs into a port, it is given an IP address from
the DHCP server and then it registers with the call server, sending an event to
E911 Manager™ with IP address and the MAC address of the phone. E911 Manager™ analyses
the IP address and launches a narrow SNMP search on the network of those voice switches
that are likely to hold the phone. E911 Manager™ queries the MIB tables of the switch
to find the MAC address and IP address of the phone. When E911 Manager™ determines
the port the phone is on, it writes the ELIN for that port to the call server. The
entire process takes just seconds.
Note: RedSky provides professional services to audit and map a customer's voice/data
network to establish locations and ELINs. Read more about our Location Audit Services.
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