The phone connection from the back of the hub should work with most modern, standard telephones (early 2000's and later). You do not need a VOIP phone as that is something different and works in a different way.
What is the make/model of your existing phone?
What problems are you having when connecting it to the phone socket of the VM hub?
The landline is a cordless BT Graphite 1500 Trio. It was up until recently been perfectly happy on our previous Sky system. Since switching to VM early December and having the landline number ported across we have never had a dialling tone. Have live chat'ed and rung different VM numbers numerous times and been told 3 times that it would be fixed in next few days, but still no dial tone (& frequently re-booted the hub). Last tech guy I spoke to ran some remote online tests which he said revealed the REN of my hanset was below 1.0 and said I should buy a new VOI phone with 1.0 REN. I told him the BT baseset stated it had a REN of 1.0 and had previously worked fine. I have since taken it to a friends house also using VM with the same router hub as mine and it worked fine (although hers was not pluigged into the back of router but into a separate conventional phone connection box (not sure of her wiring configuration). Any help advice welcomed, its not been a pleasant return to VM after ~4 years with SKY !!
The landline is a cordless BT Graphite 1500 Trio. It was up until recently been perfectly happy on our previous Sky system. Since switching to VM early December and having the landline number ported across we have never had a dialling tone. <snip>
I'm not sure what the VM tech was telling you about REN numbers. Usually a REN issue is having too many devices connected to a line (i.e. total REN on the line is too great). I think your problem is more likely to be tied up with your number port not completing correctly rather than the phone unit.