1. A system for testing a communication line, comprising: a jack for connection to a communication line; a sampler coupled to the jack; a processor in communication with the sampler; and a non-transitory memory coupled to the processor, wherein the system is operable to perform a pre-defined inbound basic test and a pre-defined inbound extended test, wherein the inbound basic test comprises: receiving at least three known frequencies defining a bandwidth greater than about 2000 Hz sent sequentially by a second system substantially similar to the system; sampling each of the three known frequencies in sequence as they arrive; storing the three known sampled frequencies in the non-transitory memory; and measuring a quality of each of the three known frequencies, and wherein the inbound extended test comprises: receiving at least five known frequencies, at least one of which is below 1000 Hz and at least one of which is above 3000 Hz, the at least five known frequencies sent sequentially by the second system; sampling each of the five known frequencies; storing the five known sampled frequencies in the non-transitory memory; measuring a quality of each of the five known frequencies; and determining that the communication line cannot operate in a secure mode.