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Recording and Playback to and from Phone Lines and Phones
https://www.sandman.com/record.html#:~:text=Plug%20the%20modular%20cord%20into%20the%20handset%20jack,application%2C%20or%20just%20start%20recording%20on%20your%20recorder.
Telephone Audio Interfaces | B&H Photo Video
https://www.bhphotovideo.com/c/buy/Telephone-Audio-Interfaces/ci/8815
JK Audio RA4 - Rackmount Adapter for Telephone Interfaces. B&H # JKRA4 MFR # RA4. $6149. Add to Cart. Add to Wish List. Special Order. Expected availability: 7-14 business days. Free Standard Shipping.
Add an audio input to Android - TechRadar
https://www.techradar.com/news/phone-and-communications/mobile-phones/add-an-audio-input-to-android-1189160
First, you need to get a 3.5mm to three RCA socket adapter for about 10 bucks. This adapter is normally used for camcorders, but plugged into your phone's headphone socket, the red RCA socket...
Properly Interfacing Audio And POTS (Plain Old …
https://www.prosoundweb.com/properly-interfacing-audio-and-pots-plain-old-telephone-service/
Analog Telephone Overview An analog telephone line, at its simplest, is nothing more than a 600-ohm balanced line. One pair of wires carries duplex (see Note 1 directly below) audio and 48 VDC for telephone operation. The 48 VDC is current limited by series resistors (one in each leg), therefore phones “on-hook” (no current drawn) typically measure 48 VDC, while …
Audio input to android smartphone through headphone …
https://stackoverflow.com/questions/19102607/audio-input-to-android-smartphone-through-headphone-jack
1) The square card reader works by sending its information through the headphone jack, so it can handle information input. https://squareup.com/reader. 2) In order to get the audio from the player to the phone, I will be using a normal aux-aux cable, similar to those used connecting a music player to speakers.
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