What about ANI, DID, and PIN callback ?

As with the calling cards scenario you can use a DID rented from a did provider or have your own gateway connected to a local telecom company. The difference is that in callback the calls are used only for triggering the callback and therefore they never get connected; the system rejects them as soon as they come. Thus, the number of required channels will be much less than in a calling cards scenario when the channel stays busy for the whole duration of the call. In callback the connection from the system to the customer is made independently, through the termination carrier defined in the dialling plan (not through the link used as an access number). 
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