Method for utilizing a communication line certificate corresponding to a first device and a second device for a communication line, each of the first and second devices including a hardware processor and associated memory includes: creating a unique ID, by a third electronic device; transmitting the unique ID to the first generating a digitally signed request by the first device, wherein the digitally signed request comprises a first proof of an association of the first device to the communication line; transmitting the digitally signed request to the second device; verifying the first proof by the second device to produce a first verification of the association of the first device to the communication line; and generating a digitally signed acceptance by the second device, wherein the digitally signed acceptance comprises a second proof of an association of the second device to the communication line.