I've got a couple options.
Option 1 - Just buy IP phones and use those.  Have all of them talk to the
SIP  provider and be done with it.

Option 2 - Buy a VoIP appliance (there are lots of different ones) with
enough analog jacks for your phones (or maybe a mix of analog and digital
phones) and use their management gui (probably a local or remote web server)
to configure the system.

Option 3 - Roll your own Asterisk system or use Trixbox (which is easier
than building Asterisk from scratch) and an analog card or two.  I happen to
have a Digium 8 port FXS card that we just took out of service, if you're
interested.

Chris


On Mon, May 18, 2009 at 5:13 PM, Tim Jackson <jackson....@gmail.com> wrote:

>
> Most ITSPs and their SBCs will release audio if the 2 endpoints are
> from behind the same firewall/IP... So audio wouldn't actually go out
> and come back in, just be hairpinned @ the ATA...
>
> Might be a good thing to check with the ITSP though...
>
> --
> Tim
>
> On Mon, May 18, 2009 at 5:08 PM, Don McMorris <don.mcmor...@gmail.com>
> wrote:
> >
> > On 5/18/09, Steven S. Critchfield <cri...@basesys.com> wrote:
> >>
> >> ----- "Kevin Hart" <bowl...@gmail.com> wrote:
> >> > Is there any decent, not bank breaking, SIP ATA's out there that can
> >> > handle
> >> > more than one phone line over voip?
> >> >
> >> > Say we have a small office and want to just use basic phones.  Have a
> >> > SIP
> >> > server already out there that we can connect to on the net that will
> >> > provide
> >> > dial tone to us.  Rather not build an Asterisk box for the
> >> > issue...just need
> >> > some adapters to plug those phones into.  Like say at least 4 phones,
> >> > to say
> >> > 2-8 phone lines.
> >> >
> >> > Is this just a pipe dream?  Am I going to be forced to build out a
> >> > full
> >> > phone system for this office just for this issue?
> >>
> >> Yes your idea is a bit of a pipe dream. Here is why.
> >>
> >> Without putting in asterisk or similar software, how do you handle the
> >> presentation of calls. Specifically, if a call comes in, which SIP
> adapter
> >> gets the call and which phone gets rung? Do you want more than one to be
> >> rung?
> > If I understand "Have a SIP server already out there that we can
> > connect to on the net that will provide dial tone to us" correctly,
> > you want to use a third-party SIP host with a 4-line ATA.  That is,
> > all your calls (even intra-office) would be through the ATA, to the
> > ITSP, and back to the ATA... right?
> >
> >>
> >> You wouldn't be all that bad off using a asterisk box to be a funnel on
> >> both sides for your calls and presentation. Plus you have a few options
> >> for your hardware then. You could go and look ahead to being bigger and
> >> buy a channel bank and a T1 card to interface it in. This would let you
> >> use some cheap 2 line phones at your desktop and go from the 2-8 to 4-16
> >> lines needed. This allows you to put some one on "hold" while you select
> >> the second line to confer with someone. Or you could turn off
> callwaiting
> >> and just see the blinking second line as an indicator instead of
> interupting
> >> calls. Of course you could do the same with some SIP UAs and reduce your
> >> wiring, but again, having asterisk or similar in your own control allows
> >> you to dictate behavior on your own terms instead of waiting for your
> >> provider set things up for you.
> >>
> >> --
> >> Steven Critchfield cri...@basesys.com
> >>
> >> >
> >>
> >
> > >
> >
>
> >
>

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