Others here have provided good reasons for your failure.
Now start by breaking the problem into parts. Take a simple
POTS phone to your NID. Open that 'premise interface' box.
Unplug the wire going inside your house. Connect phone
directly to that box. Conduct the ringing test. Now we have
important facts to further solve the problem.

"WayneSallee.com" wrote:
My telephone disconects on the first ring.
Sometimes it's the second or third ring, but it's shorting out on
the ring. What usualy causes this? so that I can fix it.