Filter
Top Products
7-15
Cisco IOS XE Integrated Session Border Controller Configuration Guide for the Cisco ASR 1000 Series Aggregation Services Routers
OL-15421-01
Chapter 7 H.248 Services—Signaling and Control
Video on Demand (VOD) Support
such as pay-per-view, or download content to a delivery device for future viewing. Delivery devices
include computers, digital video recorders, personal video recorders, portable media players, mobile
phones, and any system that can receive on-demand audio-visual content over a network.
The Integrated SBC supports different methods for delivering VOD packets over the Internet.
One method assumes that all flows of real-time streaming protocol (RTSP), real-time transport protocol
(RTP), real-time control protocol (RTCP), and forward error correction (FEC) are delivered over one
TCP connection that is initiated by the client side.
This method includes the following features:
• The TCP connection is always initiated by the client side.
• The local address and port number on the client or user side are specifically assigned by the
signaling border element (SBE).
• The local address and port number on the back bone or server side are “any,” based on the media
flow being supported by IPv6 No NAPT TCP with latching.
Another method assumes that all flows of RTSP are delivered over TCP connections that are initiated by
the client side.
Each flow of RTP for video, RTCP for video, and RTP for FEC is delivered over each
corresponding user datagram protocol (UDP) connection. In addition, when RTCP for FEC is used, it is
delivered over a separate UDP connection.
This method includes the following features:
• The RTCP port number is always RTP port +1. This is done by the SBE instructing the DBE to set
the Real-time Transport Protocol (RTP) Specific Behavior (rsb) property of the Gate Management
package to rsb=ON at assignment of the RTCP port number.
• The SBE assigns the RTP and FEC port numbers because the media flow support is IPv6 No NAPT.