Filter
Top Products
Home Numbering Plan Area Code (HNPA)
The local area code. The area code does not have to be dialed to call numbers within
the local geographical area.
Immediate-Start Tie Trunk
After establishing a connection with the distant switching system for an outgoing
call, the system waits a nominal 65 milliseconds before sending the digits of the
called number.
This allows time for the distant system to prepare to receive the
digits. Similarly, on an incoming call, the system has less than 65 milliseconds to
prepare to receive the digits.
In-Use Lamp
A red lamp on a multiline voice terminal that lights to show which call appearance
will be selected when the handset is lifted or which call appearance is active when a
user is off-hook.
Intercept Tone
An alternating high and low tone; indicates a dialing error or denial of the service
requested.
Interface
A common boundary between two systems or pieces of equipment.
Internal Call
A connection between two users within the system.
LDN: (Listed Directory Number)
LED: (Light Emitting Diode)
Loop Start Trunk
After establishing a connection with the distant switching system for an outgoing
call, System 25 waits for a short period of time before sending the digits of the called
number. On incoming calls, the received request for service is sufficient to cause the
call to route to a predetermined destination, normally the system attendant group.
No digits are received.
MET: (Multibutton Electronic Telephone)
Modem
A device that modulates and demodulates signals transmitted over a communications
path. Used to connect Data Terminal Equipment to the system’s analog ports. The
system provides a pooled modem conversion resource (12 resources maximum per
system—212A compatible).
9-7