^^^
I agree with rustynails, more info is needed to narrow this down (be long winded, it helps here
).
How intermittent? (i.e. - 1 out of 5 calls, or once a day/week/etc.)
Is it one single C.O. line that has the problem... or multiple?
(If it is one single POTS, then swap it with another C.O. position, to see if the problem follows the line)
Who is the new/old provider & how many total lines/CKT's?
