Inline Patch Telephone Audio Interface

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Inline Patch Telephone Audio Interface


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.



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.





  • 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



InputBalanced Female XLR
Impedance1k ohms
Level250 mV RMS (-10 dBu nom)
Line Input1/8" (3.5mm) Mono
Impedance20k ohms
Level250 mV RMS (-10 dBu nom)
OutputBalanced Male XLR
Impedance50 ohms
Level250 mV RMS (+12 dBu max)
Stereo Output1/8" (3.5mm)
Impedance50 ohms
Level250 mV RMS (+12 dBu max)
Left = Send, Right = Caller
Mono Output1/8" (3.5mm)
Impedance50 ohms
Level250 mV RMS (+12 dBu max)
Mixed L+R
Remote1/8" (3.5mm) TRS Jack
Connect Tip to Ring to Go Off-hook
Phone Line ConnectorRJ11C
Isolation1500 VAC
Power16 VAC, 160 mA (120 VAC, UL approved transformer supplied)
Size6" x 4.75" x 1.65" (15.3 x 12.1 x 4.2 cm)
Weight1.6 lbs