6.34
PBX R
EQUIREMENTS FOR
I
NTEGRATION
The PBX must have certain capabilities and features to work with the VPS. (Although this section includes
tests to help you evaluate the PBX, it may be necessary to refer to the PBX’s documentation for detailed
capability and feature descriptions.)
• Single Line (Tip/Ring) Port Circuits
The VPS can only be connected to a PBX that supports SLT sets (e.g. 2500 type sets). Some PBXs need
an OPX card to provide this connection.
However, some OPX cards do not provide all the capabilities
listed in this section.
Following are the minimum current and voltages that the PBX must supply:
Minimum Loop Current
20 mA
Minimum Line Voltage
5 Vdc
Minimum Ringing Voltage
40 Vac
(Frequency : 25 Hz)
• Station to Station DTMF Signaling
For system users to access VPS services and features, they must be able to send DTMF tones from their
telephones to the VPS port. As a rule, SLT sets can perform station to station DTMF signaling;
however, many proprietary telephones cannot. Some PBXs need to be programmed to make proprietary
sets use DTMF signaling.
If the PBX does not provide station-to-station DTMF signaling, VPS
services and features will be limited.
TEST:
Call an SLT extension from the telephone in question. When the call is answered, see if the
person receiving the call hears DTMF tones when numbers are dialed.
• Message Waiting Notification from an SLT
The PBX extensions should light a lamp or receive stutter dialtone when the Message-Waiting-Lamp-On
code is dialed by the VPS. The VPS functions best when the Light-On or Light-Off code is followed by
the extension number of the voice mailbox owner. On some PBXs, however, the extension number is
dialed first, followed by a hookswitch flash and then the On code. This presents a problem if the
extension is answered before the VPS sends the hookswitch flash.
If the PBX does not provide message waiting notification from an SLT, the VPS can only notify
mailbox owners by dialing a pager number or user-assigned extension.
This process slows down VPS
performance as it dials the pager or extension number and waits to confirm notification. The pager or
user-assigned extension notification is meant to be used for necessity, usually for mailbox owners who
are often out of the office (e.g. salespeople or field representatives). The only other option, without
message waiting notification, is for mailbox owners to periodically call the VPS to check for messages.
TEST:
See if an extension’s message waiting indicator can be turned on by dialing the On code from an
SLT.
• Screened Transfer From an SLT
The PBX must provide a screened transfer from an SLT for the VPS to function properly.
A screened transfer:
1. Puts the caller on hold, usually with a hookswitch flash.
2. Dials the extension.
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