Home telephone has ceased to work through internet hub

[Kernow+man]

When I try to make a telephone call, I get a two tone sound which I at first thought was an indication that I had a voicemail. However, after dialling 1571 nothing happens, I am unable to access voicemail. All lights on the router are green. I then switched the hub off and on again to reset, all four green lights are lit. The problem remains. 

[Mark39]

Is it just Voicemail affected? Can you make and receive other calls normally?

[Kernow+man]

Have checked again, I no longer get the two tone noise, but I do now get the usual dialling tone. However, I am unable to make calls out (I've tried ringing my mobile number and a relatives home number, but on each ocassion, all I get is someone saying the number I have dialled has not been recognised). I asked another relative to try ringing me on my home number, my home phone did not ring.  

[Mark39]

@Kernow+man you could try the connection test here, even if your broadband seems to be working ok (they're both delivered via the same cable).

If it detects a fault you'll be able to book an engineer online, otherwise you'll need to speak directly to Sky to report it.

https://www.sky.com/help/articles/broadband-diagnostic-start

[Kernow+man]

I reported the fault to Sky earlier today. This evening, I am now able to receive and make calls from my home number, so I am assuming that Sky have corrected the fault. Thanks.