Making VoIP Calls with Antique Rotary Phones - discu.eu

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Making VoIP Calls with Antique Rotary Phones https://nbailey.ca/post/rotary-phone-voip/ 30 comments 12/1/2021

Linked pages

Dual-tone multi-frequency signaling - Wikipedia http://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling 18 comments

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