What it SHOULD do is, check the DC voltage on the line, and if less than 8-10 volts, consider it BUSY/ unavailable/not connected, THEN check for dialtone before dialing. Also optionally listen for stutter dialtone before dialing, making the detection of stutter dialtone available for some other action.
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This is interesting. Does anyone have an example of how I can check the analog PSTN line for stutter dialtone and then perform an action based on that? What I want to do is check the PSTN and, if there's a stutter dialtone, dial an access code, record what is heard, play some DTMF, hangup and put the recording into a voicemailbox.
Any help would be appreciated.
Regards
Cameron
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