A new service designed to let Twitter users make short, tweet-like phone calls to one another begins its beta testing period today.

Jajah, , an IP communications company based in the US., launched the free service, called Jajah@call today. It's set up to allow Twitter users to launch two-minute, two-way voice chats with any other Twitter user - even without knowing the other person's phone number.

To use the new service, people have to be users of both Twitter and Jajah, the person receiving the call has to be a Twitter follower of the person making the call. In a statement, Jajah said the system should work on any Twitter platform -- from a computer to a mobile phone. source