[asterisk-users] Reverse-ATA : Using PSTN lines to connect toAsterisk

[Paul]

You can use a quad FXO gateway. Ask on the -biz list if you are looking
for suppliers.

Mike wrote:

>Thanks Alex,
>
>That was my original thought, to just buy a TDM400 from Digium and put in as
>many FXO as I wanted, but I liked having the ease of just buying something
>off the shelf, even if it meant paying a little more.
>
>But it looks like I won't have much of a choice.
>
>Mike
>
>-----Original Message-----
>From: asterisk-users-bounces at lists.digium.com
>[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Alex Balashov
>Sent: Tuesday, April 10, 2007 10:25
>To: Asterisk Users Mailing List - Non-Commercial Discussion
>Subject: Re: [asterisk-users] Reverse-ATA : Using PSTN lines to connect
>toAsterisk
>
>
>Hi Mike,
>
>   You should be looking at ATAs that have FXO, rather than FXS interfaces. 
>Most ATAs come with FXS ports so that you can connect analogue phones to
>them, but in this case you're wanting to take PSTN lines from the outside,
>so FXO is desirable.
>
>   Second, you'd have to make sure that the "ATA" supports the sort of
>application you're using it for;  most are manufactured on the opposite
>premise.  I am actually not sure offhand of any ATA firmware that I know
>that I imagine would work this way, although I'm confident it exists as
>consecutive back-to-back analogue<->VoIP adaptations in many scenarios can
>get quite complex and requires that flexibility.
>
>   Basically, you're looking for a small IP PBX that uses SIP internally
>among its private nodes and takes PSTN trunks from the outside.  That's what
>PBXs typically do.  :-)
>
>   If all else fails, you can always roll your own functionality of this
>nature by using FXO cards in Asterisk.  There are various distributions that
>package it in a very lightweight and reusable manner specifically for this
>type of purpose, or you can roll your own if it's scalable enough.
>
>-- Alex
>
>
>--
>Alex Balashov <sasha at presidium.org>
>
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