[VoiceOps] Experiences with VoIP and 100+ seat sites

Carlos Alvarez carlos at televolve.com
Wed Feb 1 11:51:46 EST 2012

On Wed, Feb 1, 2012 at 9:25 AM, Darren Schreiber <d at d-man.org> wrote:

> Hi folks,
> I'd love to hear some stories (good or bad) of hosted PBX VoIP installs on
> 100+ seat sites (single site). Specifically if you've done this with
> Broadsoft or another solidified switch. I have mixed opinions on how this
> type of scenario can be successful and now I'm being pressed by a client on
> a formal opinion. I figure having it based on experience from others on a
> similar product is worth hearing about.

I've done a couple in this range.  I don't think 100 is a lot, and I don't
think it's much of a challenge.  The "things to do" are pretty
straightforward and there are lots of sources for best practices.  For
example, if you do separate cabling and switches for the phones, then you
can simply ignore LAN QoS (CoS) and you'll have a nice separate network for
troubleshooting purposes.  This is what I do.

> Specifically curious about how you addressed call quality issues and
> ensured bandwidth and uplink were sufficient.

You need a circuit that either has QoS from the ISP, is direct to the VoIP
carrier, or a separate circuit with guaranteed bandwidth to the carrier(s)
if you want a guarantee.  That said, I've done 70+ concurrent calls over
wild internet without major issues by simply selecting an ISP with
excellent upstream connectivity.  I don't know your level of understanding
of internet routing, so it's hard to know where to go with those details.

When we deploy to our larger local customers (which to us is 25 or more),
we use a local ISP who has a city-wide WiMAX network.  They deliver a VLAN
from the customer site directly to our presence in the same facilities they
are in.  This takes the guessing out of it.  You can do the same with most
any carrier with the right engineering.  The first question would be who is
the SIP provider?

This isn't black magic.  100 phones really is pretty simple and the ability
to give them very high levels of service is well set.

Carlos Alvarez
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