Jajah has secured USD $2.75 million from an anticipated USD $5 million fourth round of funding.

Launched three years ago, the VoIP communication service has grown steadily and now provide a service to millions of users.

Although the identities of the latest investors haven’t been released, Jajah has been backed by Globespan Capital Partners, Intel Capital, Deutsche Telekom and Sequoia Capital in the past, according to VentureBeat.

The Menlo Park, California-based company previously raised USD $23 million.

Last April it signed a deal with Yahoo to provide phone-to-PC calling capabilities to the 90 million people who use the search giant’s messenger product.

In February, it rolled out software for Windows Mobile, Blackberry and Symbian that allows them to make VoIP calls over WiFi or the cellular network.

It also released a system that allows any carrier to deliver calling and text messaging services to the iPod Touch, no SIM card required.

At the start of this month, Jajah began a partnership with Bravestorm, developer of the click-to-call BoldCall product.

Under the deal, companies using BoldCall will allow visitors to their sites to call live customer service representatives in real time for free via the Jajah IP network.

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