A Virtual Session Border Controller is defined as a dedicated network element that helps to control real-time communication calls/sessions over SIP (Session Initiation Protocol) based VoIP infrastructures.

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In conclusion, the Enterprise Virtual Session Border Controller is specifically
designed to tackle the complex security, interoperability, and service quality
issues that IT organizations often face. This is because of the implementation of
the latest technologies such as VoIP, UC, and BYOD initiatives and extending
real-time IP communications across network borders.
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A Virtual Session Border Controller is defined as a dedicated
network element which helps to control real-time communication
calls/sessions over SIP (Session Initiation Protocol) based VoIP
infrastructures.
The reason why businesses need virtual SBC is due to the growing
dependence upon IP based communications and the increasing
security threats along with many others.
VIRTUAL SESSION BORDER CONTROLLER
ROBUST SECURITY
Virtual SBC offers enhanced security and encryption services to protect
privacy and prevent security breaches.
DISTRIBUTED ARCHITECTURE FOR MEDIA SIGNALLING
The distributed structure separates media plane functions such as TDM
to VoIP interworking, from signalling plane functions, such as signalling
protocol interworking and call control.
INTEROPERABILITY BETWEEN SIGNALLING AND MEDIA
ELEMENTS
The Interoperability features of SBCs act as back-to-back user agents by
making individual connections to each participating device and routing
the appropriate traffic to and from each device.
AVAILABILITY, HIGH PERFORMANCE & SCALABILITY
High availability along with network resiliency and business continuity of
the SBC makes sure that the business is always up and running.
ANALYSIS AND REPORTING
Virtual SBC built for enterprises offer analysis, monitoring and reporting
feature to understand user preferences and demands.
FUNCTIONS OF A VIRTUAL SESSION BORDER CONTROLLER
REASONS WHY VIRTUAL SESSION BORDER CONTROLLER