3.1 GUIDELINES FOR INTEGRATION
42 INTEGRATING THE VPS WITH PANASONIC KX-T PHONE SYSTEMS
3.1 GUIDELINES FOR INTEGRATION

3.1.1 APT/DPT or Inband Signaling?

There are 3 types of integration available on the KX-TVS50/80: Inband Signaling, APT and
DPT. The VPS used with any other brand of telephone equipment require inband equipment.
KX-TA624 that can use APT Integration is:
• KX-TA624 Version Y581A or higher
KX-TD series PBXs that can use DPT Integratio n are:
• KX-TD308 Version P871F or higher
• KX-TD816 Version P301O or higher
• KX-TD1232 Version P231U or higher

3.1.2 Why Integration is Important

The KX-TVS50/80 works well with most PBXs because its connections are made through a
standard single-line (tip/ring) telephone interface. Howe v er , the VPS operation depends on t he
capabilities and features provided by the PBX; its performance will vary when connected with
different PBX systems. For example, Follow-on (or Called Party) ID is a feature of the PBX.
If the PBX does not have this feature, the VPS cannot transfer calls directly to the correct
mailbox and play the busy or no-answer greeting for that mailbox.

3.1.3 How the VPS and the PBX Communicate

To the PBX, the VPS looks like SL T sets. The PBX th inks that the VPS is an SLT, and the VPS
mimics all actions a live attendant would carry out from an SLT.
For the VPS and the PBX to communicate, proper signaling is important. Like an attendant,
the VPS places calls by going off-hook and dialing numbers. It starts call transfers with a
hookswitch flash to put callers on hold and then dials the extension number. By recognizing
call progress tones from the PBX, the VPS decides how calls should be handled. Inband
Integration allows the PBX to send certain digits (DT MF) to the VPS, allowing it to recognize
the status of the extension and take the appropriate action.
Tabl e 8
VPS/PBX COMMUNICATION
PBX to VPS VPS to PBX
Call Progress Tones SLT Signals
• ringback
•busy
• reorder
• on/off hook
• hookswitch flash
• DTMF tones