I have a customer with what seems to be a 56K frame relay circuit providing his internet pipe, and he doesn't know what company provides it. He isn't getting a bill for it (Verizon DSL was dropped some time ago, and this line apparently replaced it--he doesn't recall). I couldn't determine from the circuit ID who the vendor was (the termination device showed "23XHGS" prefix), and the x-connect was a to single pair with 56K DDS written on the tag. Is there a way to find out the vendor? Verizon says it's not theirs, nor COVAD. Any hints?