All the QOS, VLAN, etc. issues make VOIP seem overwhelming. We've found the hardware simple, and the management of the lines a little more complex, but mostly because of all the call routing and messaging options.
We have 4 people in our office, plus two remote workers (an RN and a CMA) We use RingCentral's digital lines system. We have 8 digital lines dedicated to 4 desk VOIP phones and 2 wireless VOIP phones, and 2 computer based soft phones (for the remote workers). Plus we use RingCentral's Android App after hours (let's you call from your cellphone with the office Caller ID shown), and their fax service. Lovin' it for about 3 years now.
We decided we would just hook the phones up to the office LAN, and worry about QOS issues later. So far, we're still just running them through our LAN, without any issues. We have a 10mb cable internet connection, 1gb switches, and 100mb NetGear Firewall/Router. The voice quality is as good or better than POTS.
Maybe we're just lucky that we haven't had to tweak the LAN, do VLANs, etc. If so, hoping we stay that way.
