说明：  The Cisco IOS Voice, Video, and Fax Configuration Guide is the result of reorganizing and renaming the Cisco IOS Multiservice Applications Configuration Guide. The Cisco IOS Voice, Video, and Fax Configuration Guide contains information about configuring Voice over IP, Voice over Frame Relay, Voice over ATM, and telephony applications using Interactive Voice Response (IVR), fax, and video. This release adds the following new technologies: • Media Gateway Control Protocol/Simple Gateway Control Protocol • Session Initiation Protocol • T.38-compliant fax relay • Hoot and holler over IP • Caller ID