What's the pinout from RJ-11 to 3.5mm?

I'm making an adapter for a PCMCIA modem that connects it's 2-pin RJ-11 jack to an iPhone's 3.5mm headset jack, so I can make dial up connections on the road. The problem I'm encountering is the former's lack of a ground connection, so I don't know what I should connect to what.

Any ideas? I'm leaving for a trip in a day or two, so any pointers would be appreciated.

There's more to it than just a simple pin out. You need to make a circuit board.

http://2600.wrepp.com/2600/Links/25/1/vital.pri.ee/PSTN/

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