Hi, I'm trying to set up a call monitoring system for work (I work for a non-profit, we're broke so a commercial solution is out of the question) We have two phone lines, so I built two wiretaps with built in amps. I hooked one of them to the mic input on my ubuntu server. I wrote a script that uses rec from sox with a silence filter. It works perfect for that one line. Problem I'm having is I cant figure out how to record from my second tap. In alsamixer I can only set one recording device even after I installed a second sound card. I was originally trying all this with pulseaudio, but was unable to get any of it to work until I removed pulseaudio. Only way I can think to get this to work is to plug both of the taps into linein and have each of them record on one of the stereo channels, but this is not preferable. I would like to be able to record each phone call on either line into its own separate file even if both lines are in use at the same time. It would be very nice if I could do this all on one computer (as again were broke and don't have spare computers laying around). Another thing I would like, but this part isn't as important right now. If my script is running and I try to use "ssh [host] dd if=/dev/dsp | dd of=/dev/dsp" to listen in live it tells me the hardware source is in use. Anyone have any ideas or directions they could point me?

By law you have to warn people they are being recorded and provide a beep I forget the time between. No one seems to know that beep or tone part.


But to record maybe look at this and you may need an audio card that is multi channel supported or two cheap cards.

http://www.engadget.com/2005/09/27/h...-an-old-modem/

You can do the stereo recording you suggested, and later separate the channels using ffmpeg or the like

You can try running all the software (mixer etc) 2 times under 2 different users. Perhaps set the permissions so that each can see only 1 card

You can try running 2 vm's and mapping a card to each



I dont know whats the law in your place. Some places allow you to invisibly tap every call in which you are one of the 2 speakers and not a third party

The laws on recording people differ from state to state. I have looked up my local laws, and I am in compliance. I tried two cheap cards alsa will not let me set two capture devices as stated in my prev post. Have you ever recorded from two sound cards in linux at the same time? If so how did you do it? Also I already built my taps using similar principles as the link you posted.