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Plessey PABX's
After a period of popularity, Plessey PABX's are now rarely found in Australia. This page provides information for those people who still use this old but dependable technology.
Plessey CDSS PABX
Attendant Console
- Plantronics:
- Any H series headset and an M12 amplifier (Switch Setting 1, Transmit 2). These consoles require a J plug. Ensure that the handset volume is turned down and use the M12 volume (this is to prevent the headset "squealing" in your ear).
Plessey DX20 PABX
Attendant Console
- Plantronics:
- Any H series headset and an M12 amplifier (Switch Setting 5, Transmit 2).
Plessey ISDX PABX
Attendant Consoles Console Mk1, MK111, MK111A, MK1V, Screen Based
- Plantronics:
- Any H series headset and an M12 amplifier (Switch Setting 1, Transmit 3). These occasionally require a U plug.
Plessey Telephones Agent Set ISDT, ISDT300 & QLINK
- Plantronics:
- Any H series headset and an M12 amplifier (Switch Setting 5, Transmit 8). An alternative can be a P series headset and Polaris cord. Please note that the wiring on these phones varies greatly. Compatibility is NOT guaranteed.
Agent Set ISDT300+
Headsets cannot be used with this Plessey phone as the handset does not have an RJ jack (i.e. it is hardwired).
Multiline ML16S, M3000 & M5000
- Plantronics:
- Any H series headset and an M12 amplifier (Switch Setting 5, Transmit 2). An alternative can be a P series headset and Polaris cord. Requires a U plug. Ensure that the handset volume is turned down and use the M12 volume (this is to prevent the headset "squealing" in your ear).
M8, M8+, M1200 & M2000
Headsets cannot be used with these Plessey phones as the handset does not have an RJ jack (i.e. it is hardwired).

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