You dial a number (one DID that you have registered or by dialing a SipBroker number in your area) from any normal phone and you get a dial tone. After that you dial the number and call is made by using your VSPs and according to your dialing plans. It is exactly like a Calling Card, but you set the providers and you make the rules. Basically with CallThru you can use your registered VSPs from any phone, not just from an ATA connected phone.
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