[asterisk-biz] 1 T1, 1 Asterisk PBX, and 1 HylaFax system.

[Jim Capp]

Nate,

     I suggested the the T1 chaining because it provides the highest
quality calls.  When T1 channels are bridged, they don't pass through
the server (PCI bus) at all.  All the work is done on the card in native
hardware.  TDMoE risks latency issues that are tolerable with voice, but
not tolerable with faxes.  T1 chaining will pass faxes through cleaner
than any other solution.

We routinely do such pass-throughs with T1, ISDN-PRI, and channel banks.
It also works great for sitting transparently in front of a proprietary PBX,
providing a mechanism for controlled cutover.

Jim


On Thu, Oct 18, 2007 at 04:26:49PM -0600, bill dwyer wrote:
> On 10/18/07, bill dwyer <mastern8 at gmail.com> wrote:
> >
> > I have a few questions for the brain trust that is the biz list... Any
> > thoughts, critisims or flaming is welcome.
> >
> > I am looking to use 1 T1 (PRI) to split between 3 systems. Let me give you
> > an idea of what we are talking about:
> > 1. Asterisk PBX that runs our internal business phone system, (4 Lines)
> > using a TE12OP digium card with the T1 and VoIP for the internal
> > communication.
> > 2. Asterisk Voicemail system using VoIP for inbound and outbound to a
> > gateway that is attached to the T1, (4 Lines)  (Possibly the Asterisk system
> > in 1???) RIght now there is no card only ethernet. (Althoug I do have  a 4
> > line digium analog card if that makes it easier.)
> > 3. A Hylafax system running as a Efax platform for commerical purposes. (4
> > to 8 lines) Using a Digium Te220 card attached to the same T1.
> >
> > Now for the questions. Does this even sound feasible? Can I split the T1
> > between the 3 devices?
> > Can the Asterisk system in 1 be a POTS to VoIP gateway for the second
> > asterisk system? I would be willing to use the analog card if that last
> > scenerio isnt possible, but what do I use to break the analog lines off the
> > T1? I already have the 2nd system developed and running in a production
> > environment, the other 2 are in development.
> >
> > Any ideas are welcome.
> > Nate
> >
> 
> All 3 are good ideas. I already have all the hardware I mentioned so saving
> money on cards at this point isn't really the focus. Also for the same
> reasons combining the 3 servers into one seems a little risky, I would hate
> to bring down my 2 core products because I made a change to my internal PBX
> system. (The thought of my customers trying to call into my office
> because their voicemail and fax systems are not working and reaching a fast
> busy is quite scary! But it is great to know that it works!)  I do like the
> idea of using a quad card to chain the systems to other T1 cards. My guess
> is that is going to produce the lowest latency and the cleanest calls. I
> beleive we are going the SIP route internally for the PBX system but because
> of issues with Fax and VoIP the voicemail and fax system have to be straight
> T1. As for TDMoE I am not aware of what this is. Time for a little googling
> to look into that. Thanks for all of your ideas. I am glad to see that I am
> not completely off base.
> Nate

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