[sllug-members]: T1, Carriers And Info

[Adam Barrett]

Thanks for all the input on the Fax machines...

Any information about T1 HOWTOs etc?

Thanks!

On 3/1/07, Chris Brown <sllug at vpxp.com> wrote:
> Adam,
>
>   Fax machines WILL work, with caveats.  When using G.711 codec (the
> industry standard for "good" voice quality), faxes work more or less
> ok.  Often one or two pages will go without trouble, but when sending a
> 20 pager it's likely to encounter a failure.
>
>   However, if using the T.38 protocol faxes can be very reliable.  With
> T.38 the ATA device (must be one that supports T.38, such as SPA-2102,
> Audiocodes, Quintum, etc) the ATA device decodes (rather than encoding
> like G.711) the Fax signal and sends the resulting data to the distant
> end SIP termination device (which must also support T.38).
>
>   Another related protocol, T.37, is store and forward.  While the T.38
> protocol is a real-time streaming of the Fax data to the far end
> termination device, T.37 completely receives the fax, then forwards the
> data to the far end T.37 terminate to resend out the PSTN.  This
> protocol is less common.  The advantage of T.38 is that the two fax
> machines can communicate and agree to the best common features (such as
> higher resolution, color, etc) while T.37 only uses the lowest normal
> features since it has no idea what the far end device can support.
>
>   On private networks I've been very successful with T.38 devices.
> Shameless Plug: Layer-4 (local VoIP provider, see below) can support
> T.38 endpoints to ensure quality fax delivery.  They/we also provide
> inbound Fax-to-Email such that all inbound faxes are received as emails
> if you so choose.
>
> Chris Brown
> Layer-4, (801)990-3988
> CCI Intellisys, (801)975-7466
> Arrivaltel, (801)990-3990
> cell: (801)949-0300
>
>
> Adam Barrett wrote:
> > I also have a follow up question about VoIP and Fax Machines.
> >
> > Are there any known problems? Will Fax machines work with VoIP?
> >
> > Thanks again!
> >
> > On 2/28/07, Adam Barrett <dragen at gmail.com> wrote:
> >> Hey All,
> >>
> >> I have recently taken a position with a small company, we are looking
> >> into moving our phones to VoIP, for all the good reasons, and I was
> >> talking with my current carrier and as best I can tell I have a single
> >> T1 line, currently running 6 phone lines.
> >>
> >> I was hoping that I could find some help here on Asterisk, as well as
> >> what the heck I need to know to handle phones on my own, or in
> >> conjunction with my carrier of choice.
> >>
> >> Does anyone have a decent site that explains the steps, tools, methods
> >> for working with T1 lines, and the accompanying equipment?
> >>
> >> Can anyone suggest a good carrier who might support Asterisk in Utah?
> >>
> >> Can anyone suggest some books I should be reading before even
> >> attempting this feat?
> >>
> >> I appreciate all the help you guys have offered in the past, and I
> >> look forward to helping people too someday :D I just haven't settled
> >> in my knowledges yet.
> >>
> >> Thanks!
> >>
> >> --
> >> Adam Barrett
> >> dragen at gmail.com
> >> ______________________________________________________________________
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> >> Join SLLUG and other UT LUG members on irc.FreeNode.net channel #Utah
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> >>
> >
> >
> ______________________________________________________________________
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-- 
Adam Barrett
dragen at gmail.com