If you have the unused bandwidth then your current network can  do it. VIOP 
data is not as much as you think. I would however segregate with VLAN's and 
prioritize the voice packets.  I am not a big fan of plugging the computers 
into the phones, I would re-patch if you can budget for that. What about POE 
for the phones?...if you don't go that route then you have to plug power bricks 
in for every phone.

From: Tom Miller [mailto:[email protected]]
Sent: Monday, May 02, 2011 9:39 AM
To: NT System Admin Issues
Subject: VOIP design questions

Folks,

We are planning to retire our current phone system and move to a Mitel VOIP 
system.  Not having implemented VOIP before, I have some questions for those of 
you that have:

- our vendor claims our current data network can easily handle VOIP traffic 
since it's a small amount of traffic (don't know exact amount yet, still 
awaiting vendor response).  As such, they tell it is possible to use our 
current network to accommodate voice and data.  I'm not sure if I"m comfortable 
with this.  I was thinking of a more segregated approach:  different network 
and voice and data never intersect.
- our vendor claims we can use the existing data jack for the phones, and plug 
the desktop PCs/laptops into the phone as a sort of switch.  I'm thinking this 
would add another level of complexity:  phone is broke and by the way you can't 
get on the network now.
- the reason the vendor suggests the above is that the current voice drops 
(cat5) terminate to phone patch panels (in most cases). Those cables would need 
to be cut and re-terminated to switches.

So I have some concerns about our vendor claims.  The dollar figure they 
propose does not include network changes, new switches, etc.  Looking at the 
cost proposal, I am thinking there are quite a few hardware and man-hours costs 
missing.

What do you folks do for VOIP?

Thanks,
Tom


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