Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Recording Cable

Recording Cable

Recording Cable

Hi, I need to make a cable that will allow me to record a telephone call..

would it be possible to make a cable with rj11 pins 1+5 to a 3.5mm jack, insert that into a audio recorder with auto start.. so when a call is incoming, and the recorder senses data, it begins to record..

is this possible.. ??

Many Thanks
Yurov Ardyy

RE: Recording Cable

Before going too much further, please check the laws, for your area, that govern recording telephone calls. If you are located in the US, laws vary widely from state-to-state.

How you would go about connecting a device to record calls depends on the set-up. For example,
are you trying to record from a standard POTs line or an extension off of a digital key system/PBX?

I love2 "FEATURE 00"

RE: Recording Cable

Hi, Thanks for the reply, its just a standard analogue POTS line. It is in the UK, and i have our admin looking into the legalities of it..


Many Thanks
Yurov Ardyy

RE: Recording Cable

Here in the U.S., several companies sell a device that will do this. Try Radio Shack or MCMelectronics.  

Iolair MacWalter
Network Engineer

RE: Recording Cable


Not sure if the US version will work here in the UK, but will make enquiries. Thanks again.  

Many Thanks
Yurov Ardyy

RE: Recording Cable

"is this possible.. ??"

Not the way you are trying to do it. Due to voltage and impedance mismatches you can't simply run a phone pair into a recorder and get decent audio. For auto start/stop you need to detect the on-hook and off-hook voltages and fire a relay.

Quite a few vendors have a box to do this:

Or build your own:

As to legal issues, that is you to you. Be careful!


RE: Recording Cable

Thanks for that the first item on the list looks pretty good, will test it out..


Many Thanks
Yurov Ardyy

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close