[2005] How to send and receive audio through 2 wires

I need to be able to send and receive audio which is easy, but I only have two wires to do it with...
I can easily record sound through the audio in prot, and send sound to the audio out port, but how can I do both at the same time with only two wires. I thaught about using the serial port, but I need the analog signals...

Any ideas will be great...
Thanks

You can't send and receive at the same time with only two wires. You would need four wires at a minimum, one positive and one negative for each action. You are also limited to the capabilities of the sound card, if that is the way in which you intend to send/receive signals. Also, if you want to send and receive at the same time, you will need each handler to be on a seperate thread. Even then I would expect some kind of delay between the two. Furthermore, the best interfaces that I know of for bidirectional communication are parallel, USB, and Firewire.
Can you give more details? Maybe there is another solution.

Hi

Here is my goal...

I want to be able to use my PC to interface with my local telephone network so i can make calls from my PC and eventually get an answering machine set up(not that I would ever check the messages) I should have no probs once I manage to get some signal communication up and running properly.
the local telephone network uses tone dialing, and only uses two wires...
I would like to take the most basic functions of a simple telephone, like to dial numbers 0 to 9 for starters...I initialy thaught I could just connect the phone and record thesignal of each button press, to emulate it later, and then I realised that I have this problem of the input and output and having only two wires to do it with, and I am stumped at how to get around it.
I know verry little to nothing on the subject of electronics, so I am hoping to litteraly handle everything with code if i can...

Let me know if you think I am missing something, I have no doubt there will be allot more obstacles, but I will deal with them when they come, initial communication is the short term goal...

Telephone systems that only have two wires do not permit sending and receiving at the same time. This is noticeable when you try to talk over someone unsuccessfully. That is because the two wires act like a switch. If one end of the connection is transmitting, the other end is receiving. That is because the two wires are managing the sending and receiving of signals, one function at a time. You might find it easier to purchase a voice modem and get the SDK's from the manufacturer. This will manage the phone technology for you. All you have to do then is manage the signals that are sent and received.

I thaught about using a modem, maybe I should have thaught harder...
I guess its time to get a voice modem and do some work then, it would have been good to do it from scratch, but I guess that will require me to learn some electronics, but thats for another time...

Thanks...

Do not under any circumstances connect your sound card directly to the telephone system. You will blow it to smithereens. It is also very likely that you would receive a visit from your local phone company and/or police. A voice modem or high speed internet connection is the only real option for this as they have been designed and approved to interface your digital computer to the analog phone/data networks.

Yeah, I have since smartened up a bit on this subject, and I realize it was a very very stupid question. what I was trying to do, was make a modem(or part of ones functionality) without realizing or thinking about it.