PUBLIC Telephone Operators will become the dominant Internet Service Providers in future, according to James Clark, chairman of Netscape and the founder of Silicon Graphics. 'I am sure the existing telecoms companies will be the main providers; the likes of Deutsche Telecom, AT&T, BT, France Telecom and NTT. These are the people you will call in future to get connected to the Internet,' Mr Clark said. Speaking at the Internet Telecom 95 event being held in Geneva in conjunction with the Telecom 95 exhibition, Mr Clark said the Public Telephone Operators were the best equipped group to provide Internet connection because they already had much of the necessary infrastructure in place. He was dismissive of the current state of the Internet Service Providers (ISP) industry: 'A cottage industry of ISPs has grown up to service the market but the people who own the pipes are the logical ones to provide the service. 'They are looking to grow into other areas of business than voice, and the Internet will be one of them.' Mr Clark has an impressive history in Silicon Valley. He founded Silicon Graphics in 1982. His present company, Internet software specialist Netscape, had a stunning stock market debut in August, with investors pushing up the share price to a level which valued the company at more than US$1 billion. Investors were betting that Mr Clark could repeat the enormous success of Silicon Graphics in the Internet arena. Last week, Mr Clark said he was a relative newcomer to the Internet. 'Before I met Marc AnMreesen at the start of 1994, all I had used the Internet for was E-Mail. I had used Mosaic [the first graphic browser which preceeded Netscape's] once, to find Marc AnMreesen's E-mail address. So I have learnt a lot in the past year.' Mr Clark said the Internet would eventually overtake the existing phone system in terms of the amount of voice traffic it carried. 'Everything you can possibly imagine that is to do with communications will occur down the Internet. 'The Internet will subsume voice, although we may continue to have a voice network because it requires voice communication.' Mr Clark, whose company has prospered by giving away its software on-line, said all suppliers on the Internet should adopt a code of openness. 'If you invent a new protocol you have to make it a public domain specification, not keep it private. The whole idea [of networking] breaks down if too much is kept private. He said as far as possible, new products and services should be multiprotocol. 'You shouldn't have to go out and buy Windows 95 to get a Web browser . . . everything needs to work on multiple systems.' Mr Clark's company has been in the news recently with successive groups of specialists cracking its security codes. 'We hear so much about lack of security on the Internet but I don't think it is any less secure than the phone system. You trust the phone system because the switches are operated by a few companies while Internet switches go through several companies. We say security is fundamental and we integrate it in all our products.'