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Second dialtone
In telecommunication, the term second dialtone has the following meanings:
1. Dialtone presented to the call originator after an access code[?] has been dialed for access to a second, outside, telecommunications system or service.
2. Dialtone returned to the call originator after she/he has dialed an access number and has reached a switch providing access to modem, to a fax machine, to another telephone, etc.
Source: from Federal Standard 1037C
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