Some VoIP users still cling to TDM

摘要

Enterprise telephony vendors are clear that IP is the future, but customers haven't universally agreed how to get there. Some companies that made grand commitments to IP telephony are scaling back to hybrid environments, while others are forging ahead with pure-IP convergence plans. News, last week that Merrill Lynch is migrating from a Cisco-based IP telephony network it installed in 2000 to an environment based on a mix of Avaya-based IP and TDM telephony gear raised eyebrows among industry watchers. A Merrill Lynch spokesman says the company was concerned that having data and voice on one network could leave the firm susceptible to outages, either accidental or the result of a hostile attack.