I'm working on setting up a small business with IP Phones to connect to the Asterisk Server. Now, for simplicity we just ran 2 CAT5e lines to each room, and 1 was hooked to a phone jack, before my VOIP plan was approved. The VOIP phones we got have a port to connect to the computer as a switch. Are there any downsides to using the built in switch on the phones or should we patch in the second lines to each office for the phone as dedicated cat5?