iPhone control cable to work with any set of headphones.

[macbook123]

Is there a control cable for the iPhone 3 GS/4 that can be used with any set of headphones? I.e. something that plugs into the phone, and has a mic and control button(s) at the end that allows for regular headphone jack to be plugged in and use as a free speak with the Mic in that cable? Presumably all one would have to do is shorten the cable of the headphones, e.g. by putting a knot in.

Thanks in advance.

 

[lorenwade]

I believe these are what you're looking for.

Monster iSoniTalk
Griffin SmartTalk
Shure MPA-3C
Generic