YouTube video courtesy of Jajah

Jajah is a Voice over IP (VoIP) service that lets you call conventional telephones at a low cost. They just launched an interesting service (beta release) for Twitter users...

JAJAH Gives Voice To Twitter

You can see how it works by viewing the embedded video above. It lets two Jajah subscribers call one another via Twitter. The caller types in something like...

@call @twitter_username

Jajah first calls your phone. Then, it dials the called party and connects the two phones together to complete the call. Calls can be made for free during the beta test period. However, these free calls are limited to two minutes.