Google has refused to confirm or deny reports that it is planning to launch a voice over IP (VoIP) telephony service.

The rumours were fuelled when the company posted a job ad last week seeking a 'strategic negotiator' with experience in the "selection and negotiation of dark fibre contracts both in metropolitan areas and over long distances as part of the development of a global backbone network".

Industry analysts pointed out that the ad could signal moves into IP telephony, adding that such plans could be a big money spinner for the company.

"What a sweet extension to Google's advertising-driven business model," said Julian Hewett, chief analyst with Ovum.

"The appeal for Google is obvious: search for something then 'click here' if you'd like to speak to the company that's selling what you're looking for. Google then collects a fee from the 'sponsor' for each voice connection."

A popular VoIP network would demand the provision of substantial capacity over backbone infrastructure fibre.

However, after over-investment in the sector during the internet boom of the 1990s there is still a large amount of dark fibre which as been laid but remains unused.

"This is pure speculation and we do not comment on rumour," said a representative of Google UK. "We are not aware of any moves to enter this arena."