Avaya 1210 - Manual (Page 144)

Terms you should know
144
Network Address
IP address. Uniquely identifies a device on the network. Used for
routing information to that device.
Off-hook
Any line selected to make a call or receive a call. The term off-
hook is applied whether (a) the end user lifts up the handset, (b)
the end user presses a line key, (c) the call is automatically
answered at the IP Deskphone, or (d) a line is automatically
selected for an outgoing call.
Paging tone
A special tone (two beeps followed by dial tone) that sounds
when you use the Radio Paging feature.
Power-Over-Ethernet
Provides power over the network cable that is also used for data
communications.
Registrar
See SIP registrar
Ringback/ring tone
A sound indicating that a call you have made is ringing at its
destination.
Services key
A fixed key used to access options such as Telephone Options,
Password Admin, Virtual Office Login, Virtual Office Logout, Test
Local Mode, and Resume Normal Mode.
Shared Directory Number
A DN (extension) that is shared by two or more persons.