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A company called JAJAH is addressing the possibility of ad-supported VoIP by improving the ease with which carriers and callers can jump aboard.

JAJAH offers phone credit to callers enabling them to opt in to ads through a partnership with Oridian, an ad network that targets international internet users, reports Ars Technica.

Intel and Deutsche Telekom are also on board.

JAJAH dubbed the user-targeted ads "AdWords for the phone." The company alsodeveloped an ad system that overlays audio recording while a call is connecting, so messages will not interrupt callers when they're connected.

Additionally, carriers will be able to use JAJAH's platform to monetize their inventory.

An ad-supported mobile service called Blyk launched in the UK recently, but the service is demographically limited.