Can you use your iPod for VoIP communication? Touchmods have accomplished this never thought before use of an iPod and is sharing it with us.
I read about this on Hackszine.com. Thetouchmods is a place where you can find all kinds of DIY hacks for your . They have got tutorials for all the hacks too, but the most popular one is the VoIP on iPod hack.

The story starts when the Touchmods team built a mic input for the iPod touch. The line-in pin is clearly visible in the pinout of iPod connector shown on the iPod wiki. From then they came a long way through making their first hand soldered mic to now selling neat small mics on their site.
This is the schematic of the first mic circuit they made for the iPod touch.
They have got their own SIP VoIP servers running now. If you are a DIY hacker or just want to buy the ipod touch mic go to the touchmods blog which has been moved to WordPress due to unavailability of their site on blog.com
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