Question : Planning to configure VLAN's and Q.O.S. on a Cisco Catalyst Layer 3 switch - have a couple of questions...

I've been looking at Cisco Catalyst 3560 switches, as a platform on which to configure vlans and enable QualityOfService for an expected VOIP implementation.  I have a plan, but I recognize that I've never done this before, so my plan may not be perfect....

Our existing setup:
- 3Com Superstack 3 Switch 4300 w/48 10/100 ports, and no gigabit module or Q.O.S., all of which are being used for workstations and printers.
- Some off-brand 24-port Switch, uplinked to the 3Com via a 10/100 port, about 6 of which are used.

Our intended setup:
- (1) Cisco Catalyst 3560 layer 3 switch w/48 ports, Q.O.S. enabled and configured with separate vlans for (1) workstations & printers, (2) servers, and (3) voip.  The 3560 we're looking at has 4 gigabit ports, 1 of which will be on vlan#1 for the link to the 2950 switch below, 1 of which will be on vlan#2 for the 1 server, and the other 2 will be unused for now.
- (1) Cisco Catalyst 2950 switch, uplinked via a gigabit port to the 3560, as the 'spillover' switch for vlan#1 (will use 6 or 7 right away)
- keep the 3Com 4300 switch to plug in all voip phones into the 3com, and 'uplink' via a 10/100 port to a 10/100 port on the 3560.  The port on the 3560 that it plugs into will be in vlan#3(voip).  Also, Q.O.S. will be enabled on the 3560.
- the gateway from there to the internet is through a Cisco 2610 router.

Questions:
1)Will Q.O.S. really happen for the voip phones, given that they're all directly connected to a 'dumb' 3com switch, since they are then 'uplinked' to a 10/100 port on the 3560 switch, which is vlan'd and Q.O.S. sensitive?
2)Does the 'spillover' switch for the additional workstations and printers (in this case, we're thinking a 2950) have to be vlan-able for the workstations connected to this switch to be 'part of the vlan#1'?  Or, is it sufficient that the uplink port on the 3560, to which the 'spillover' switch is connected, is configured as part of vlan#1, so the traffic coming into it from the spillover switch is automatically part of that vlan#1?
(In other words, do I have to setup Vlan Trunking Protocol to extend the vlan down to the spillover switch, to have all ports on the spillover switch be part of the same vlan#1 on the 3560?  My impression is that you need to setup VTP when you intend to have the ports on the spillover switch be part of multiple vlans, like the main switch, but that wouldn't be our intention.  We'd have all ports on the spillover switch be part of the workstation vlan(#1)
3)Does Q.O.S. need to be enabled on the 2610 router for the voip packets, which will travel out to the internet, to still be recognized by Q.O.S. as voice packets?  In other words, the switch will be prioritizing the voip packets via Q.O.S. before they get to the router, on their way to the internet, but will they then lose their q.o.s. 'stamp' if the router doesn't also do Q.O.S.?  I'm not sure if our 2610 router does Q.O.S., but I'm thinking it either doesn't, or we might have to upgrade the I.O.S. to do so....

These questions are 'urgent' in the sense that we're trying to get a plan together to submit to the higher-ups by January, so I'll throw in plenty of points.
Thanks in advance for your 'knowledgeable' comments!

Answer : Planning to configure VLAN's and Q.O.S. on a Cisco Catalyst Layer 3 switch - have a couple of questions...

1) Well sort of. QOS is intended to give things like VoIP priority over other applications. Since that link will be ALL VoIP there's not much QOS to be done anyway. All the packets will be the same size and the same priority and theoretically they should all get equal priority. Where it matters is when this traffic is being mixed with other stuff. See #3 below.

2) It doesn't have to be but it should. you don't need VTP though. Just create the vlan on both sides and use it.

3) Definitely you will want to do that, so that someone browsing the web doesn't get priority over VoIP. In your case, priority queuing is the way to go and that is definitely supported (as well as more complex QOS) on the 2610.  Please keep in mind however that once the traffic leaves your router you have no control. One thing you can do is to mark the VoiP with IP precedence of 5, which will at least give it priority if someone is listening, which they're not likely to be.

I'm curious why you don't use the 3COM for the spillover switch and the 2950 for the VoiP?