Making a Security Call
Consider modem A calling modem B to access the host of modem B. After
the two modems are configured, modem A dials modem B. When modem B answers
(by use of S0 or ATA command), the two modems go through the initiate, challenge,
response, and confirm steps that are defined below.
If a call back was not negotiated, both modems issue the CONNECT result
code and communication proceeds. If a call back was negotiated, modem A
disconnects and waits for an incoming call, the call back from modem B.
When modem B calls, modem A answers automatically and the two modems do
the callback and accept procedures described in the Security Handshake section.
If successful, both modems issue the CONNECT result code and communication
proceeds. For more information click the following topic:
Security Handshake Phases
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