Version 6.6 725 October 2014
Installation & Operation Manual 43. Session Border Controller (SBC) Application
43 Session Border Controller (SBC)
Application
This section describes the Session Border Controller (SBC) application.
43.1 Overview
The Session Border Controller (SBC) application provides the following functionality:
VoIP firewall and security for both signaling and media.
Topology hiding
Admission Control
Routing:
• IP-to-IP routing translations of SIP, UDP, TCP, TLS (when extensive
transcoding is not required)
• Load balancing and redundancy of SIP servers
• Routing according to Request-URI\Specific IP address\Proxy\FQDN
• Alternative routing
• Routing between different Layer-3 networks (e.g., LAN and WAN)
ITSP accounts
SIP URI user and host name manipulations.
Coder Transcoding.
To enable the SBC application:
1. Pre-load the SIP boards with a License Key that enables the SBC feature. Refer
to Updating License Key for details.
2. In the SBC Configuration Settings, set the Enable SBC Application parameter
to Enabled. See Section ''SBC Application' on page 723 for details.
43.2 VoIP Firewall
The SBC application implements the following firewall features:
SIP signaling:
• Deep and stateful inspection of all SIP signaling packets
• SIP dialog initiations may be rejected based on values of incoming SIP
INVITE message and other Layer-3 characteristics
• Packets not belonging to an authorized SIP dialog are discarded
RTP:
• Opening pinholes (ports) in the device's firewall based on Offer-Answer SDP
negotiations
• Deep packet inspection of all RTP packets
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