iPhone:Recording conversation feature?

I want to develop an iPhone application which has to 开发者_如何学Pythonrecord the phone conversation. Can some one give me the instruction how can i achieve this?

thank you.

This is currently not possible. The iPhone doesn't allow applications to run in the background. When the phone application comes to the front (i.e. you get/make a phonecall), all other applications are shut down.

This is currently not possible with the SDK. Not sure outside of it.

Since background applications aren't possible and calls cause a foreground application to relinquish control, there's no way this could be done.

You can find something like that here. Seems to use an external service and goes around the restrictions (no background apps) by that. Maybe that helps.