In breakdowns, a first telephone filter is normally made to find out what or what may be the possible causes of the same, then an attempt is made to solve it if possible by this means, in case it is not achieved, according to the severity and customer contract, first the load is fed by manual bypass (direct power line) and then from there we proceed to go to the customer to verify and diagnose the fault more thoroughly.
Once the exhaustive report is obtained, the material is recruited and returned to the client to solve this anomaly.
In some cases, if the fault is simple or repetitive or easy to diagnose (they are not the majority) you can go to the client with the material to solve it (prior budget approved or if there is a current contract, under this contract).
Whenever a telephone fault is attended to, an attempt is made to collect as much data as possible from the installation as well as from the equipment involved. The more information you have, the easier it will be to solve the problem.