asterisk users - Apr 2007 - Reverse-ATA : Using PSTN lines to connect to Asterisk

Hi,
 
I'm looking for a few pointers on using ATA to connect Asterisk to the PSTN.
Basically, I'm running a Hosted PBX service, and in urban centers I can
usually get SIP or PRIs.  Since I sell my customers SIP hardphones, the data
flow is like this:
 
Customer's SIP Hardphone ---- My own Asterisk ----- Outside lines
 
But when it comes to smaller villages (I deal with people in tiny places),
I'd like to reuse their own PSTN line this way:
 
Customer's SIP hardphone ---- My own Asterisk ------ Some device on the
customer's premise ---- customer's PSTN lines
 
 
I know ATAs are mostly used in a scenario where you reuse traditional phones
to connect to SIP servers, but can they accomodate my scenario? And if so,
what line of ATA should I be looking at?
 
Mike
 
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On 4/10/07, Mike <list@virtutel.ca> wrote:
>
>  Hi,
>
> I'm looking for a few pointers on using ATA to connect Asterisk to the
> PSTN.  Basically, I'm running a Hosted PBX service, and in urban
centers I
> can usually get SIP or PRIs.  Since I sell my customers SIP hardphones, the
> data flow is like this:
>
> Customer's SIP Hardphone ---- My own Asterisk ----- Outside lines
>
> But when it comes to smaller villages (I deal with people in tiny places),
> I'd like to reuse their own PSTN line this way:
>
> Customer's SIP hardphone ---- My own Asterisk ------ Some device on the
> customer's premise ---- customer's PSTN lines
>
>
> I know ATAs are mostly used in a scenario where you reuse traditional
> phones to connect to SIP servers, but can they accomodate my scenario? And
> if so, what line of ATA should I be looking at?
>
> Mike
>
Hello Mike,

Wouldn't a Sipura SPA 3000, with an FXS and an FXO, handle what you want?

Cheers,

Francis


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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@presidium.org>