[asterisk-users] ATA recommendation??

[Jerry Jones]

>
>> Hello,
>> I want to ask that if thee are some ATA decives that i can use to  
>> connect
>> mutliple analog phone lines to my VOIP system..
>> I mean for example an ATA device with 24 ports with 24 independent  
>> SIP
>> accounts.
>>
>> For example for some dormitories in my area, i want to put an ATA  
>> device
>> and move existing lines to VOIP accounts.
>> Only problem is, if i dont give seperate SIP accounts for all  
>> ports, i can
>> not control who is calling where... And the billing system will  
>> also be a
>> problem in that case.
>>

These are called SIP Gateways. There are several manufacturers who  
make them. I would suggest Audiocodes, Vega, or Carrier Access as  
starting points. Yes they come in 24 and 48 port versions.