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

[Mike]

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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