can u please clarify me some points...1.Do any voip service will work with this ATA ??2.From where in india I can get it(ATA),is ata cheap in usa??3.Do I have to subscribe to SIP server for using this??4.do IP telephone works on same concept ??5.What are the requirement for this set up ?? If there is any article,link on this then please share with me.I m completely new to this,so pls forgive me for any mistake.🙂