Depends, If the phone system is already setup and you are just adding this in to get more ports for other things I think it will coexist with the rest of the network fine. If you are starting from scratch you will need to check with the manufacturer of the phone system to see what the phones require. Generally speaking you will want to have the phones on their on VLAN and they are often powered by the switch as well (POE). This is not a programmable switch and is not POE either so my knee jerk response is no not if you don't already have the phone system setup.