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The Test Call http://thetestcall.blogspot.com/
Mon 19 Mar 2018 05:24:53 PM PDT archive.org

The Test Call is the homepage of a free (and legal!) service that offers some telephony debugging services, such as echoback (say something, it records it and plays it back), DTMF identification, a 4KHz sweep for audio quality, and caller ID checking.

service callerid testing dtmf free telephony tones
4213 links, including 278 private
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