Can I use SIP (VOIP) lines with my Telos Nx6 or Nx12 ?

YES !

Simply purchase a Linksys PAP2T. This device is fully parameterable (it has a built-in webserver)and will convert 2 SIP lines into POTS, carrying CallerID and even loop current checking (when calling party hangs up), to the same standards than in the USA.

We use it at NeoGroupe for our test Nx12 lines and it works perfectly.

So for a 6 lines system you will need 3 x PAP2T.