The provisioned video bandwidth amounts always include room for the audio payload. The payload for G.711 uses 64 kbps of bandwidth, leaving 320 kbps for the video payload.
Cisco recommends adding 20 percent to the requested video bandwidth amount to provide a safe buffer for overhead. 256 kbps * 1.20 = 307.2 kbps reservation.
H.263 is the lowest-common-denominator video codec between an SCCP and H.323 device. If two SCCP devices communicate, they will attempt to use the newer (and more efficient) H.264 codec.
When using the nongatekeeper-controlled intercluster trunks, the only choice you will have for call admission control is the CallManager Location feature. By placing the local IP Phones and intercluster trunk in different locations, you can control how much bandwidth CallManager allows over the trunk.
Within a cluster, CallManager locations control the WAN bandwidth used. This is typically done in a centralized call-processing environment.
The H.320 standard is used to stream video over an ISDN network. To communicate with this standard, you must employ a video gateway.
Videoconferencing requires you use a multipoint control unit (MCU) to mix the signals. SCCP clients can handle a video call (two users), but cannot handle a conference (three users or more).
Far-end camera control (FECC) is an H.323 capability allowing you to remotely control a variety of settings on a video camera.
The Cisco proprietary wideband codec offers impeccable quality, but is considered a "LAN-only" protocol due to the whopping 7 Mbps it consumes.
One of the major features supported by the Cisco CallManager 4.0 release was video (along with the new IP telephony security structure).
Part I: Cisco CallManager Fundamentals
Introduction to Cisco Unified Communications and Cisco Unified CallManager
Cisco Unified CallManager Clustering and Deployment Options
Cisco Unified CallManager Installation and Upgrades
Part II: IPT Devices and Users
Cisco IP Phones and Other User Devices
Configuring Cisco Unified CallManager to Support IP Phones
Cisco IP Telephony Users
Cisco Bulk Administration Tool
Part III: IPT Network Integration and Route Plan
Cisco Catalyst Switches
Configuring Cisco Gateways and Trunks
Cisco Unified CallManager Route Plan Basics
Cisco Unified CallManager Advanced Route Plans
Configuring Hunt Groups and Call Coverage
Implementing Telephony Call Restrictions and Control
Implementing Multiple-Site Deployments
Part IV: VoIP Features
Configuring User Features, Part 1
Configuring User Features, Part 2
Configuring Cisco Unified CallManager Attendant Console
Configuring Cisco IP Manager Assistant
Part V: IPT Security
Securing the Windows Operating System
Securing Cisco Unified CallManager Administration
Preventing Toll Fraud
Hardening the IP Phone
Understanding Cryptographic Fundamentals
Understanding the Public Key Infrastructure
Understanding Cisco IP Telephony Authentication and Encryption Fundamentals
Configuring Cisco IP Telephony Authentication and Encryption
Part VI: IP Video
Introducing IP Video Telephony
Configuring Cisco VT Advantage
Part VII: IPT Management
Introducing Database Tools and Cisco Unified CallManager Serviceability
Configuring Alarms and Traces
Using Additional Management and Monitoring Tools
Part VIII: Appendix
Appendix A. Answers to Review Questions