Already, Gmail serves as a control panel, an always-open tab, for the loyal Google user. It offers quick and simple access to our email, contacts, calendar, documents, chat and more. Soon, it may be home to a Web-based telephony client. According to CNET, Google has begun testing a Gmail-integrated VoIP (voice over Internet Protocol) client that would allow users to make phone calls directly from the browser. Sponsor The feature is different from the voice and video chat that is already available from Gmail using the chat feature, in that it isn't solely between chat users.