Question : DSCP QOS on powercoonect 6224,3548 and 5224

I have single subnet with three powerconnect switches.  All on Default VLAN.
I have acquired this network and haven't quite eliminated all the garden variety dumb switches.  We have recently replaced our phone system with VOIP phones.  

I would like to implement some quality of service without creating new vlans if possible as I have a subset of cases where computers are piggy backing off the phones ethernet runs.

 From what I can tell my best bet is to implement DSCP QOS.  The phones have the ability tag the EF(46) tag.

As far as I can tell the switches all have the ability to prioritize traffic with these tags.  I am assuming that the computers by default will fall into a lower priority queue.  

I have gone ahead and configured all three of my switches based on my understanding of their feature sets.  

I took screenshots from the web admins of all three powerconnects (in sections) and attached it to this post.  

I guess what I am hoping for is that someone can either validate or poke holes in my proposed implementation.  

Secondly if the proposed implementation is valid does it look like I have configured the switches correctly?

switchconfigs.doc (482 KB) (File Type Details) 

Switch Configs

Answer : DSCP QOS on powercoonect 6224,3548 and 5224

I only see a drawback of using the same vlan, how do you know who to trust? where's your trust demarc? how do you prevent one of your user from marking it's computer traffic with EF by using a malicious application?
By default the computer will not mark the traffic, but a evil user will be able to mark it with the use of customer tools, most of the time this will not be a problem, but you better be aware it could happen.