Quadro6L/4L Manual I: Installation Guide Step 2-B: Using Key System EmulationStep 2-B: Using Key System EmulationThe Key System Emulation is a widely used service in legacy PBXs simplifying the directconnection to the available PSTN lines. On the Quadro6L/4L, the usage of Key SystemEmulation services is limited to the IP phones attached to the Quadro through the availableIP lines and provides direct connection to the available PSTN lines and SIP networks. In itsturn, the IP phones are limited to the following models with the perspective to enlarge thelist of recommended IP phones in the future:• Aastra 480i • Aastra 6739i• Aastra 9133i • snom 320• Aastra 55i • snom 360• Aastra 57i • snom 370• Aastra 480iCT • snom 820• Aastra 57iCT • snom 821• Aastra 9480iCT • snom 870• Aastra 6731iThe Key System Emulation feature allows to:• Have a direct connection to the available PSTN lines and SIP networks behindthe Quadro by pushing the programmable keys on the IP phone.• Monitor the availability and status of all configured external lines via programma-ble keys on the IP Phones.• Place the call on hold from one IP phone and pick it from another IP phone at-tached on the Quadro.Go to the Telephony menu of the Quadro’s Web Management for Key System Emulationservice configuration.By default, the 6 FXO lines of the Quadro6L device are correspondingly attached to the first6 SLA lines (SLA 7 and SLA 8 are inactive) and the 4 FXO lines of the Quadro4L are corre-spondingly attached o the first 4 SLA lines (SLA5, SLA6, SLA7 and SLA8 are inactive).Fig. l- 34: Key System Emulation pageQuadro6L/4L; (SW Version 5.2.x) 37