Telecom operators and communication service providers can minimize these issues by employing Session border controllers to secure their VoIP infrastructure and control the access to VoIP services.

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Telecom operators and communication service providers can minimize these issues by employing Session border controllers to secure their VoIP infrastructure and control the access to VoIP services.
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.