Thank you for such a quick reply.  So, having the desktops plugged into port 2 of the phone won't affect the quality?  I was under the impression that if I created separate vlans, I could tag the voice traffic on that port and not tag the other traffic, therefore the voice would get priority on that port.  But if you don''t think that will be a problem, that would simplify things for me.   Next question:  The things you recommended, the traffic shaping and QoS, those are done on the router, the switch, or both?
I will research at your links in the meantime.  Thanks again.

---

Michael, I really don't think VLANs are necessary.  I base that on having several clients, as small as 10 phones at a single location to a school system with 100+ phones at four geographic locations, and none of then have a VLAN. Traffic shaping, QoS, Prioritizing traffic (everybody & every manufacturer has a different name for it) is what I recommend you research and apply. 

---

Michael-Reed: Did you ever get clear information on this question? In my experience, small IP phone installation using hosted services (like RingCentral) seem to work OK without VLAN setups. The catch comes when you try to troubleshoot a particular problem. The tech support will start questioning you in general about how your network is set up and if they don't like the answers, you will not get much help. I recently had an installation going from one provider to RingCentral. The phones with the old provider generally worked fine with no special network settings. That provider never came up with network configuration guidelines except to quote the generic QOS/traffic/double-NAT jargon even though we used the network router/firewall that they recommended. We were on our own as to how to implement "good" settings. RingCentral provided thorough guidelines and some general recommendations from the support engineer, like: "phone VLAN, data VLAN, mgmt VLAN" separation. There were warnings about support if I didn't do it "their" way. The RC documents explain every possible way that you could set up your network and let you divine the best way on your own. It is still not clear to me if the phones actually read their VLAN tags in their software or put VLAN tags on outgoing ethernet packets or mark them with Layer 3 data. I found one very good document on the Sonicwall setup for the LAN-to-WAN path that includes DSCP mark-up. The phones boot and provision successfully and there are no obvious issues with voice quality. Beyond that, it looks like regular experimentation and recording of data is necessary to become proficient in my particular network setup. It's obvious that nearly all "engineers" are trained on Cisco gear for these topics but mostly shrug when confronted with questions about specific non-Cisco gear.

---