Power

The existing Public Switched Telephone Network (PSTN) carries a low voltage power connection directly from the telephone exchange, which is sufficient to power some basic corded handsets without needing to plug them into a power outlet. As part of the move to digital, power will no longer be sent down the line. This means that your phone service and B4RN router will not function in the event of a power cut unless you have a backup power system such as a battery or generator.

In the event of a power cut, assuming you can provide power to the router and aren't able to use a mobile phone, we would recommend having a simple corded handset that doesn't require external power.