surge protection & backup power

You should have surge protection on all of your phone lines, and either a surge protector or a UPS (Un-interruptible Power Supply) with surge protection on the power line.

Modern phone systems are generally very reliable, but they can be damaged or destroyed by power surges coming from the electric outlet or a phone line.

Phone system warranties usually don't cover damage from surges, and the loss of of a phone system for even one day can be devastating for a business and extremely inconvenient for a family, so USE PROTECTION. 

• Don't rely on protectors installed by your phone company, and don't think you're fully protected if your phone system is connected to a UPS.
• UPSes keep your equipment running during a power failure, and protect the equipment from power line surges, but usually don't protect phone circuits. We find much more damage coming from phone lines than from power lines.
• Protectors should be used on BOTH ENDS of any circuit going between two buildings.