At TNT Computer Support we deploy Grandstream(www.grandstream.com) phone systems. These systems can use your existing network wiring to support the phones and avoid re-wiring your office for a new system. Wherever there is network there can be a phone. There are also wireless options.
- Gigabit network
- If power outages are a concern a UPS and special powered network switch would be recommended
2 or 4 port brains are about the size of a standard office phone. They take up very little room, and can also be wall mounted.
16 and 24 port Brains take a bit more space and should be rack mounted and can also be wall mounted.
There are several options for different phones. Here are some examples: