Telephone wall jack wiring diagrams vary based on the number of phone lines attached, but Ask-The-Electrician.com shows a clear diagram of a standard residential phone jack and gives detailed instructions for installation. The Ace Hardware Corporation website offers several diagrams for single and multi-line phone jacks.
Ask-The-Electrician.com rates the complexity of wiring a phone jack as intermediate to advanced and recommends that this job be performed by a licensed electrical contractor. To avoid accidental electrical shock, all electrical circuits in the job area should be turned off and tagged before beginning the installation. This job requires basic electrician hand tools and a voltage meter.