jtarrio / SoftwareModem

An implementation of the ITU-T V.21 modem standard, working on a PC over a sound card.
Apache License 2.0
35 stars 4 forks source link

How do I hook this to the real Telephone (PSTN) line #3

Open veso266 opened 12 months ago

veso266 commented 12 months ago

Hi there, I was wondering, how would I go about hooking this into a real phone line

I saw a box once: https://www.jkaudio.com/that-1.htm

that had 2 audio ports, and 2 phone jacks and allowed you to tap into your telephone line (not sure if this particular box would work, since it may have some bandpass pass filters, as it was meant to send/receive voice frequencies)

So because this box doesn't ship (or if it does, shipping is too slow) to my country, will need to do it myself

How would I do this myself, I don't want to send 100V (usualy 48V) into my sound card

Thanks for Anwsering

jtarrio commented 12 months ago

Sorry, I can't help you with hardware to connect your computer directly to the phone line -- I'm not qualified to design hardware.

However, you could build an acoustic coupler, which is a fancy name for a microphone and a speaker with rubber cups that you can attach to your telephone handset. This is how real V.21 modems used to work, so it would be an even more authentic experience :-)

Note that this program is not a finished product, but more like a tech demo. It doesn't expose a COM port or anything usable with terminal emulator software -- it only displays what it receives. If that's enough for your purpose, great. If you have the programming knowledge to make it do what you want, great. Also, it was my first or second C# program ever, so it's not written very well and I haven't touched it in years so I may not be able to be much help.

Just setting expectations :-)