think you have the mk1 pstn

This is a photo of the back if this helps....

will this not work with the mark ii phone, as I read online that they were backwards compatible.

Your mark 2 handset should work with this PSTN. If it has allowed you to register the handset to the base but it won't make or receive calls it is either a set up issue or a faulty product.

Have you tested the phone line with another phone?

The PSTN should connect to a three way splitter into the socket marked "APP". The splitter should NOT have a white dot on it as this is for the older version of the BeoCom6000 base. The splitter then has two more sockets marked "LINE" and "POWER". The power goes to your electrical mains socket and the line goes to the phone socket. The line cable should have a square plastic plug at each end. The end that goes into the wall socket should then have an adaptor that converts it for the BT wall socket. If you have any variation from this it will cause no operation.

Can you post a pic of your cables and how they are connected?

Opman

I had the same problem a few times and it turned out to be the telephone provider which was Virgin at the time. There was a problem with the phone cable outside my home and nothing to do with the phone setup. 

Maybe phone your telephone provider and ask them to check your line.

Dan

Here Opman

This is the setup currently....

I have also tried using a different phone cable too

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Fixed it! I used a different cable and an adapter at the end and all works well .... Thanks for your input

I'm glad that you have been able to resolve the problem. 🙂

Opman