Instruction manual

Hardware and Endpoints
INTER-TEL
®
5000 ADMINISTRATOR GUIDE – Issue 2.3, September 2007
Off Premises Extensions (OPX)
Page 103
Off Premises Extensions (OPX)
Off premises extensions are remote single line DTMF endpoints connected to the Inter-Tel sys-
tem through telephone company OPX circuits, or customer-provided circuits.
OPX endpoint users gain access to the features by hookflashing [recalling] (pressing and
releasing the hookswitch quickly) and entering feature codes.
Some telephone company OPX networks do not recognize certain single line endpoint ring
cadences used in the system. This incompatibility results in an inability to provide certain ring
signals to OPX endpoints. Because of this, the system is equipped with an endpoint option
known as Extended Ring Cadences, which allows the ring cadences be altered for individual
single line circuits.
Extended Ring Cadences
Table 18 shows the different standard and extended ring cadences for the various types of sin-
gle line endpoints used on the Inter-Tel telephone system in the United States.
Table 18.
Ring Cadences for Single Line Endpoints
Single Line Endpoint Cadence Type Description
Single line endpoint
connected to IP SLA,
SLA, or T1 OPX
Standard IC Ring A repeating 2-sec cadence that rings twice.
Each ring lasts 200 ms and is separated
from the next ring by 400 ms of silence. The
remaining 1.2 sec is silent.
Extended IC Ring A repeating 6-sec cadence that rings twice.
Each ring lasts 800 ms and is separated
from the next ring by 400 ms of silence. The
remaining 4 sec are silent
Standard CO Ring A repeating 6-sec cadence that rings once
for 2 sec followed by 4 seconds of silence.
Extended CO Ring Same as Standard CO Ring cadence.
Model 8560, Model
8520, Professional,
Executive, Standard
and Associate MDPM
Standard IC Ring This cadence has two 250 ms rings every 2
sec.
Extended IC Ring A repeating 3-sec cadence that rings once
for 1 sec followed by 2 sec of silence.
Standard CO Ring A repeating 6-sec cadence that rings once
for 2 sec followed by 4 sec of silence.
Extended CO Ring A repeating 6-sec cadence that rings once
for 4 sec followed by 2 sec of silence.