3.1 GUIDELINES FOR INTEGRATION42 INTEGRATING THE VPS WITH PANASONIC KX-T PHONE SYSTEMS3.1 GUIDELINES FOR INTEGRATION3.1.1 APT/DPT or Inband Signaling?There are 3 types of integration available on the KX-TVS50/80: Inband Signaling, APT andDPT. 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 higherKX-TD series PBXs that can use DPT Integration are:• KX-TD308 Version P871F or higher• KX-TD816 Version P301O or higher• KX-TD1232 Version P231U or higher3.1.2 Why Integration is ImportantThe KX-TVS50/80 works well with most PBXs because its connections are made through astandard single-line (tip/ring) telephone interface. However, the VPS operation depends on thecapabilities and features provided by the PBX; its performance will vary when connected withdifferent 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 correctmailbox and play the busy or no-answer greeting for that mailbox.3.1.3 How the VPS and the PBX CommunicateTo the PBX, the VPS looks like SLT sets. The PBX thinks that the VPS is an SLT, and the VPSmimics 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 ahookswitch flash to put callers on hold and then dials the extension number. By recognizingcall progress tones from the PBX, the VPS decides how calls should be handled. InbandIntegration allows the PBX to send certain digits (DTMF) to the VPS, allowing it to recognizethe status of the extension and take the appropriate action.Table 8VPS/PBX COMMUNICATIONPBX to VPS VPS to PBXCall Progress Tones SLT Signals• ringback• busy• reorder• on/off hook• hookswitch flash• DTMF tones
