We typically use an Open House or OnQ 110 module then wire as many RJ-11's as lines needed at any location. Example
Home Office needs lines 2 (office line} and 3 {fax/modem line)
Use a 3 port wallplate. Install 1st jack with line 2 on the primary terminals & line 1 on the secondary. (this gives them access to both the office # and the main home # IF he has a 2 line phone). On the 2nd RJ-11, install line 3 on the primary's and 4 on the secondary.
The last port on the plate would be for an RJ-45 used with a dedicated Cat 5 network cable. Using a different color jack (usually blue) helps avoid user confusion.
If you do not have a Structured cable enclosure, Home Depot carries little Leviton 10 port 110 blocks that can be fastened to plywood or just about anything else.
Hope this helps,
Brian E