Product specifications

Dialogic® BorderNet™ 4000 SBC Product Description Document
7
The BorderNet 4000 SBC can operate at 99.999% availability without impacting call
sessions during system switchovers or malicious attacks.
B2BUA Architecture
A back-to-back user agent (B2BUA) is a logical entity that controls SIP signaling between
the endpoints of a call. A B2BUA acts as a user agent server (UAS) when it receives a
request, and then the B2BUA acts as a user agent client (UAC) to process the request. A
B2BUA manages the entire call from connection to termination, which means a B2BUA is not
limited by strict transparency requirements of a pure SIP-proxy. Instead, a B2BUA acts
similar to a proxy in some instances and similar to an end user agent in other instances,
depending on the operator’s requirements.
The BorderNet 4000 SBC supports a configurable range of B2BUA transparency levels, from
a strict B2BUA to a fully transparent B2BUA. The BorderNet 4000 SBC maintains
independent dialogs on each side of a call and still allows other SIP message and header
information to be passed transparently across the system. Alternatively, the BorderNet
4000 SBC can be configured to suppress, modify, or insert a wide array of information
between the two call halves to maintain the strictest privacy while still allowing the widest
possible interworking between otherwise incompatible SIP networks.
The BorderNet 4000 SBC maintains full transaction, session, and dialog statefulness
(“Dialog Stateful B2BUA” mode). If media management is enabled, full media statefulness is
maintained. In this case, the BorderNet 4000 SBC modifies session descriptions in SIP
messages so that media passes through the system.
Call Management
BorderNet 4000 SBC B2BUA architecture has the following capabilities:
• Setup, modify, and tear down call sessions
• Manage the independent dialogs (on the separate call-halves) that make up a
session
• Allow for varying levels of message and header transparency based on configuration
• Intercept and regulate media traffic
In a point-to-point call scenario, the B2BUA uses its UAS leg to process incoming requests
and its UAC leg to determine how the request will be answered.
Certifications and Compliance
Broadsoft Broadworks Certification
The BorderNet 4000 SBC is certified against Broadworks Release 18, which encompasses
the basic and advanced Class 5 feature set. See the Broadworks Session Controller
Interoperability Test Report for additional information.
Miercom Certification
The BorderNet 4000 SBC earned the Miercom Performance Verified Certification for
maintaining a maximum of 32,000 simultaneous calls while under an INVITE flood attack. In
addition, the BorderNet 4000 SBC:
• Maintained a maximum of 32,000 simultaneous calls while under an INVITE flood
attack.