How to wire up bell 801 entry telephone?


25 Feb 2014
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United Kingdom
Hi, I have bought a bell 801 entry telephone. I took the old entry phone off which had 5 wires connecting into it, blue, black, red, yellow and green. All I need to do is connect these 5 wires into the five ports on the new bell 801 phone, these are labelled Z T O R I. I have tried many combinations and the phone does not work right. Does anyone know what colour wire goes into to which port????

Many Thanks, Joe.
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Was the old phone a bell system handset? If not it may not work.... Also there is no standard wiring colour code , do you know what colour came from what terminal on the old handset ?
I took a picture of the wiring in the old handset before I removed the wires and connected it up to the bell system in the same order but it's not working properly. Also, the old have set did not have connections such as irotz but used numbers instead. I can let people through the door on the bell system it's just the intercom system, I can hear people but I can't speak to them through them intercom.
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