Developing call/vocie recording app (iphone)?

I want to make an iphone application to record the incoming and outgoing calls. If I can't develop such app , What are the technology and hardware hindrance in doing so ? BTW i was thinking to run my app in background while call, Hence开发者_高级运维 recording the input and output voice through my app .

An iPhone application doesn't have access to the voice channel in an iPhone in any circumstances. Which is a good thing, as having a background application recording voice could have very bad side effects.

Apple has a lot of awesome tutorial code. below url is speakHere that Apple recording sample code. this code maybe some would be help to you. http://developer.apple.com/library/ios/#samplecode/SpeakHere/Introduction/Intro.html