Migration to VoIP is already under way for Australian businesses and will reach $850 million by 2009, according to IDC.
Despite equipment vendor wars for leadership in the market, there will be no one winning solution in the market in the future.
IDC's study, Australian VoIP services and equipment forecast and analysis 2005-2009, found one in seven companies in Australia have already deployed some form of VoIP enterprise system and the self-implementation model is still the most popular.
The reason why companies are installing enterprise VoIP systems continues to be based on lowering operational and hardware costs, despite the push on advanced applications.
IDC telecommunications analyst Susana Vidal said there will be a rise of managed/hosted IP telephony implementations in 2005, not just by telecomms carriers but by system integrators and broadband service providers.
Also, enterprise VoIP equipment and services revenues are expected to grow this year by more than 70 and 73 percent respectively, and the growth will continue to be strong in 2006 and 2007, she said.