SIP User's Manual
480
Document #: LTRT-12804
Mediant 800 MSBG
8.4
SBC Application
This section provides a detailed description of the device's SBC application.
This section includes the following subsections:
Overview of the SBC application (see ''Overview'' on page
SIP networking definitions (see ''SIP Network Definitions'' on page
)
SIP dialog-initiation process (see ''SIP Dialog Initiation Process'' on page
User registration and the device's database (see ''User Registration and Internal
Database'' on page
)
Media handling (see ''SBC Media Handling'' on page
)
SBC Dialog Admission Control (see ''SIP Dialog Admission Control'' on page
Handling SIP 3xx Redirect Responses (see ''Handling SIP 3xx Redirect Responses''
on page
)
SIP Diversion and History-Info headers interworking (see ''Interworking SIP Diversion
and History-Info Headers'' on page
SBC configuration example (see SBC Configuration Example on page
8.4.1
Overview
The SBC application supports up to 150 SBC sessions and provides the following main
features:
NAT traversal (see ''NAT Traversal'' on page
VoIP firewall and security for signaling and media (see ''VoIP Firewall'' on page
)
Topology hiding (see ''Topology Hiding'' on page
SIP normalization (see ''SIP Normalization'' on page
Survivability (see ''Survivability'' on page
)
Routing (see ''SIP Network Definitions'' on page
and ''SIP Dialog Initiation
Process'' on page
):
•
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)
Load balancing\redundancy of SIP servers
Internet Telephony Service Providers (ITSP) accounts
SIP URI user and host name manipulations (see ''SIP Dialog Initiation Process'' on
page
)
Coder Transcoding (see ''SBC Media Handling'' on page
)
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