This is a common situation.
Someone hires an electrical contractor to do their phone wiring.
If you are hiring a contractor to do your wiring for you, print this article out and give it to your installer. For Trouble Many contractors will install your phone wiring in daisy chain fashion unless told otherwise. This causes problems because you have one common set of wires for all of your phone jacks. This is bad. The trick to futureproofing your phone wiring is to wire your home or office in a star configuration.