Avaya IPO over PTP T-1s Switch / Router Configurations

Good Afternoon,

We just got two T-1 lines installed and I want to run the Avaya IP office phone system over the WAN to connect the different plants together.
right now I only have the Avaya IPO in our Arizona facility but I plan on bringing the MA facility online within the next couple months. How do I configure QoS on my switches and Routers?
here is my layout

Avaya IPO is connected to a cisco 2960 24 port gigabit switch
2960 switch is connected to a sonicwall for internet access/VPN access to main facility and to a cisco 1841 router with a T-1 connection to MA
I have a cisco 2821 router with two T-1 lines 1 going to the 1841 in AZ and 1 going to my MS facility connecting to another 1841.
The 2821 router is connected to (2)  2948G 48 port switches.
The 2948G switch connects to a sonicwall that connects to the internet hosts IPSEC VPN tunnels from AZ, MS, and mobile users
We are going to upgrade to voicemail pro and put the VMP server in MA. I will be having around 15voicemail connections at one time from MA, MS, and AZ.

any more info needed?
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KCDeanConnect With a Mentor Commented:
I think the key question is do you have the hardware in every area possible.
"Anyone who has ever lived near or traveled through a big city has experienced the frustration of a traffic jam. Sports car or SUV, beat-up wreck or Bentley, all cars crawl along at the same pace when the number of cars exceeds the capacity of the road. The common question all drivers ask as they tap their steering wheels impatiently is, "Why didn't they do a better job of planning this road?"
The practical reality is that roadways are built based on traffic flow assumptions and funding constraints. Networks operate with the same constraints, which is why congestion inevitably occurs."
So I guess is all hardware in place to make this work, with good results.
"QoS is not a solution that is implemented in a single product. In order to work effectively, all of the equipment that has a role in forwarding traffic through the network (for example, routers and switches) should support QoS. Even more importantly, these different network components must have the same understanding of how traffic is to be classified and prioritized, otherwise there will be a breakdown in communication—and inevitable congestion—somewhere in the system.\"

From what I can see you hardware looks good but I just wanted to make sure.
As I will be doing VOIP in the near future, and will be researching this very soon.

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