(dial-up service (DNIS)) is based on the dial number for online try to authorize, DNIS (transfer have dial-up number) can identify number allocated to the receiver, and is the most standard number provided by the telephone company, for example, you can allow all through specific dial-up number online for free, if it is to identify the DNIS type online...
H. 323 (communication protocol) is a set of standards that can not guarantee...
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