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VOIP systems configuration (simple terms)

We will be going the above route this year.  I have been told that in order to have true voip phones working over a SIP trunk we need VLANs.  Correct?
If so, i know nothing about VLANs but from a quick search it simply reduces and segregates the traffic in order for QOS.  Correct?

Shortel system is looking favourable.  I belvie this needs layer 3 switches.  We have and HP HP V1910-48G and 3Com Baseline Switch 2952-SFP Plus which i would like to continue using.
Both are 48port and i'd like to use 1x switch for phones and 1x for data/computer traffic.
Do we need to vlan in this case still?

If so how do we configure basic vlan settings?  

We have also another option to go MPLS which will help guarantee the QOS as this will be managed by the ISP and thus reduce bottle necks.  

What are the views on hosted and private solution for voice?
How easy are vlans to setup?
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David Akinsanya
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Just to give an overview:

Looking at Shoretel phone system or avaya.

We have 2 sites with users (25 @ A and 10 @ site B) and a 3rd workplace recovery (DR) site, so no users here.

MPLS option is recommended by our isp using c&w system.
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Seems MPLS is the way forward then to ensure QOS...

convergint: did you install the Cudatel yourselves?
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90% on the way to shoretel...