Inline Patch

Telephone Audio Interface
JK Audio Inline Patch

Works with Cordless Phones.

This unique hybrid works with your telephone to give you more control over interview recording and playback. The Inline Patch is a little box that connects between the base of an analog or cordless telephone and the wall jack. You can continue to talk on the phone and get access to audio on both sides of the call. The unit’s two back-to-back hybrids give you complete control of audio from both sides of the call. Audio input jacks let you mix sound bytes or music into your conversation. One stereo output jack provides your voice on one channel and the caller's voice on the other channel. A second output jack contains a mix of both voices. Front panel control for each output offers all the control you will need. The Inline Patch does not disrupt your Caller ID or ring signals.

Learn More Details Specs

Product Details

Works with Analog Telephones or any Cordless Telephone.
XLR Input/Output
1/8" (3.5mm) Stereo Output
1/8" (3.5mm) Mono Output
1/8" (3.5mm) Mono Line Input
1/8" (3.5mm) for Remote On-Hook/Off-Hook
Front Panel Separation Control Fine Tunes Voice Separation
20 dB Nominal Separation of Phone Line Transmit/Receive Audio
Made in America


For telecom demo or teleconference presentations, you can use a cordless telephone. Walk around the room and talk over the phone while everyone listens in. Let the audience try your IVR application.

Record to your Sound Card

Use the Inline Patch to record great interviews directly to your sound card. Then you can upload the files to your podcast.

Radio Applications

For Radio Stations, the Inline Patch can be used as a simple phone-line hybrid coupler. The Off Hook/Norm switch lets you seize a phone line without using a telephone. This switch can be remote-controlled with a simple contact closure.

TV Applications

The Inline Patch is also perfect for television or cable talk show use, when you may need access to audio from a working telephone on camera.

JK Audio Inline Patch Back


Input Balanced Female XLR
Impedance 1k ohms
Level 250 mV RMS (-10 dBu nom)
Line Input 1/8" (3.5mm) Mono
Impedance 20k ohms
Level 250 mV RMS (-10 dBu nom)
Output Balanced Male XLR
Impedance 50 ohms
Level 250 mV RMS (+12 dBu max)
Stereo Output 1/8" (3.5mm)
Impedance 50 ohms
Level 250 mV RMS (+12 dBu max)
Left = Send, Right = Caller
Mono Output 1/8" (3.5mm)
Impedance 50 ohms
Level 250 mV RMS (+12 dBu max)
Mixed L+R
Remote 1/8" (3.5mm) TRS Jack
Connect Tip to Ring to Go Off-hook
Phone Line Connector RJ11C
Isolation 1500 VAC
Power 16 VAC, 160 mA (120 VAC, UL approved transformer supplied)
Size 6" x 4.75" x 1.65" (15.3 x 12.1 x 4.2 cm)
Weight 1.6 lbs