I've used genuine B-Wire Connectors for years without stripping the conductors and NEVER had a problem. However, recently tried imitation connectors from two different companies (both blue in color) supplied by Sprint North, and both have frequent failures! I can monitor for dial tone downstream of these connectors and make it come and go by squeezing the beenie! By the way, if you Google "B wire Connector", you can find the real manufacturer and learn how many billions sold!