[olug] OT: Bandwidth Requirements for VOIP

[Craig Wolf]

>From Cox's mouth: "we can only do best effort on the Cable Modem side".  I
have problems across my enterprise doing faxes because of Cox and their
"best effort".  Voip has been good but that is because I have their Metro E
pushed directly back to my corporate office and I QOS my equipment.  To
adjust to this, there will be a fax server investigated next year...
They are using 1498 for their MTU so we had to adjust all our routers to
that as well...took testing to find that out, they would not tell us.

Very frustrating.

Craig Wolf
(402)990-3010


On Sun, Dec 23, 2012 at 12:43 PM, Justin Reiners <justin at hotlinesinc.com>wrote:

> The only way we could switch to VoIP reliably with Cox (in their words) was
> switch to optical internet. Then they would be able to do QoS on it.
> On Dec 23, 2012 12:34 PM, "Dave Thacker" <dthacker at bluestrain.net> wrote:
>
> > On Sunday, December 23, 2012 10:45:43 AM Dan Linder wrote:
> > > I'll second Lous comments.  Even at five calls times 60k is well below
> > the
> > > 1MB of the low end data rate plans.  If you dont have Internet for them
> > > yet, look at the low end business class options from Cox.  Their SOHO
> > > option I had the past couple years was only  $30/mo than regular home
> > > internet, but the QoS was separate from the Cox home users so snow days
> > > didn't affect performance.  Another plus is your a business so you get
> > > priority in the repair queue.
> > >
> > > Dan
> >
> > The office is currently on a Cox Business Plan.  We're looking how to
> > match up
> > capacity with future use.
> >
> > DT
> > >
> > > On Dec 23, 2012 9:36 AM, "Lou Duchez" <lou at paprikash.com> wrote:
> > > > When you say "VoIP", do you mean you'll be using Vonage, or Asterisk,
> > or
> > > > what?  Is there a particular goal you're trying to meet by switching
> to
> > > > VoIP?
> > > >
> > > > The minimum bandwith is pretty much a function of the compression --
> a
> > > > call can take 10k or 60k, depending.  Also, faxes don't tend to work
> > that
> > > > well over VoIP, and certainly not with G.729 compression (the low
> > > > bandwidth kind).
> > > >
> > > > And if you're using DSL or cable modem for both VoIP and Internet
> > > > traffic, you may experience dips in quality if the VoIP is competing
> > > > with downloads.
> > > >
> > > >  QoS can help, but it can really only help with the outbound part of
> > the
> > > >
> > > > call; the prioritization of traffic coming down the pipe is decided
> by
> > > > your ISP.
> > > >
> > > > I find that VoIP can be as reliable as regular phone service, but to
> > > > really do it right you need a business-grade VoIP product provided
> by a
> > > > carrier like XO, and it will likely involve buying a phone system.
> >  Cheap
> > > > VoIP over a DSL can work pretty well, for the most part; but if your
> > > > business is utterly reliant on your phones, hiccups and problems
> caused
> > > > by cheap VoIP may hurt your business more than you save.
> > > >
> > > >  I'm looking at moving my wife's office over to VOIP this year. There
> > are
> > > >
> > > >> currently 2 lines supporting 4 users.   Fax traffic is less than 20
> > > >> pages a
> > > >> week in/out.   Talk time can be sometimes be quite lengthy when
> > dealing
> > > >> with
> > > >> the IRS or clients.   What would you recommend as a good bandwidth
> > level
> > > >> to
> > > >> support the office?  Are the other questions I should be asking?
> > > >>
> > > >> Thanks!
> > > >> Dave Thacker
> > > >>
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