Автор: [автор не указан] Год: 2002 Издание: [не указанo] Страниц: 522 ISBN: 9780071406345 In 2002 voice over IP will constitute more than 25% of all long distance voice calls, according to Network World. That’s more than a 30% ramp-up from 2001. The emergence of SIP, MPLS and new quality of service tools is making carrier grade voice over IP
