zgutnytsky · 15-Ноя-07 15:19(17 лет 8 месяцев назад, ред. 05-Дек-07 16:16)
Cisco Voice Gateways and Gatekeepers Год: 2006 Автор: Denise Donohue, David Mallory, Ken Salhoff Издательство: Cisco Press ISBN: 1-58705-258-X, 978-1-58705-258-3 Формат: CHM Количество страниц: 648 Язык: Английский Описание: Deployments of voice over IP (VoIP) networks continue at a rapid pace. Voice gateways are an essential part of VoIP networks, handling the many tasks involved in translating between transmission formats and protocols and acting as the interface between an IP telephony network and the PSTN or PBX. Gatekeepers and IP-to-IP gateways help these networks scale. Gatekeepers provide call admission control, call routing, address resolution, and bandwidth management between H.323 endpoints including Cisco IOS® voice gateways and Cisco® Unified CallManager clusters. IP-to-IP gateways allow VoIP calls to traverse disparate IP networks.
