Digital phone line

[rmp0105]

I recently moved my Mums broadband over to EE/BT, part of the move was going from an analogue to digital land line. 
where the line comes into the property it terminates into a double master socket in an upstairs bedroom. An open reach engineer has branched that off to a single master socket in the lounge. 
When the line was analogue broadband and phone worked on the double socket upstairs. But only the phone worked in the single socket downstairs (even with a filter!

since moving over to digital the phone only works when plugged into the router and into the double master socket. I know the phone has to be plugged into the router on a digital line. But the master box downstairs no longer works at all. No even if I plugged the router in with filter. 
my question is how can I get the single master box downstairs working and have a phone plugged in downstairs?

[JimM11]

@rmp0105 Can you please check one thing before advice is given, the Master Phone socket there should be NO WAY that the phone connection works in any format what so ever, the only live connection is the RJ11 plug for connecting the DSL port of the Router to the OR Master socket.

The DV Landline can only work if plugged into the back of the EE/BT Router or to a remote DVA.

Will watch for the reply.

[Mustrum]

@rmp0105    You would need to have someone to rewire the extension cable into a connector that then plugs into the phone socket on the router.

EE could arrange an Openreach engineer to do this for you, however you will likely be charged for doing so, last time I looked I think it was around £160.  Or you may find someone advertising such services in local ads.

[rmp0105]

The phone only works when plugged into the router and the router plugged into the broadband outlet in the double socket.

[XRaySpeX]

That's how it should be with Digital Voice. It does not come down thro' the standard phone sockets unless you do some wiring adaption by connecting them to the Phone socket on the router.

[JimM11]

@rmp0105 Rather than repeat it all again linked the page for you to go read and see if it makes sense for you to do.

Issues with Digital Voice Adapter connecting to Wifi Extender - Page 3 - The EE Community

[XRaySpeX]

1. The double master socket upstairs is filtered so that the BB signal is not passed to any other sockets; only the voice signal is passed on but only for the old analogue landline.
2. The single phone socket in the lounge is not a master socket but a slave or extension socket for voice only, not for BB.