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Posted - Oct 25 2003 : 5:22:35 PM
I have a computer with a VOIP application.
I want to be able to connect a (preferrably cordless) phone to it.
Is there a way to connect a phone to computer's sound card so that the phone will think it's online?
The circuit doesn't necessary need to be able to ring the phone, but just to connect phone's mic and speaker to computer ones.
Any ideas? I'm a programmer and don't understand much in analog circuits ;-(
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| 3 L A T E S T R E P L I E S (Newest First) |
| YS |
Posted - Oct 27 2003 : 12:47:15 AM
You can use the modem to interface the outside phone, cordless or not, to computer. You will need to add a "telephone line simulator" device between the modem and your cordless phone, so both units will think they are conected to the phone line. The thing shall provide about 7V, 26mA DC into each of units and connect them together with some loss. Typical loss in phone network is 20 dB or 10 times. So, if you take 12VDC power supply (stabilized) and connect (-) to one wire of phone and one wire of modem (call it ground), then connect (+) to another wires on the phone and on the modem via separate 180 ohm resistors. Then, connect these another wires together via 1.8k resistor. Should work. If your power supply is not stabilised, you wil hear "hum".
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| cirvin |
Posted - Oct 25 2003 : 10:43:56 PM
well a voice modem take care of your problem, but you can tie the speaker leads to the line in and the mic leads through a voltage divider into the mic input
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Posted - Oct 25 2003 : 5:33:27 PM
Ah, and one more thing: is it possible that a regular computer modem contains the relevant circuits so that it would be possible to salvage it for the task? It could even power itself from the computer's power supply...
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