Awaiting Inspiration has published an article that describes how to create a DIY iphone call recorder:

I’ve wanted a way to record phone calls to and from my iPhone since I’ve had it but hadn’t really looked into solutions until a couple of weeks ago. What I really wanted was a native iPhone app that would record incoming and outgoing phone calls – there is SpoofApp but it requires a JailBroken phone, per-minute fees, and looks like it only works on outgoing calls. Another iPhone app Recorder 10, does not require a JailBroken phone but like SpoofApp you have to pay per-minute fees and it only records outgoing calls.

So with no native iPhone apps out there I looked for other ways and found this solution which uses a splitter form you iPhone headphone output to record one side of the conversation. It seems like the obvious solution but requires that you use a computer to record your side of the conversation. Plus I found that the headphones acted as a microphone, so when you listened to the recording the other side of the conversation echoed. Still, in a pitch a workable solution.

Not finding anything that did the job, in either software or hardware, led to the creation of a DIY breakout box. The solution allows for individual volume control for you and your caller and has jacks for record, mic and headset.

You’ll need to be able to read simple schematics to build the iPhone call recorder.

If you’ve got a more elegant solution, leave a comment below!