Session Border Controller (SBC)

The Session Border Controller (SBC) is a critical network element in SIP-based communication systems, designed to facilitate secure and efficient interconnection between disparate SIP networks. Operating at the edge of networks, SBCs provide a control point for session traffic crossing the network border, ensuring that communication flows smoothly and securely between internal and external SIP domains. 

Functionality: 

Security: SBCs are pivotal in protecting SIP networks from various security threats, such as Denial of Service (DoS) attacks, fraud, and eavesdropping. They employ a range of security measures, including packet inspection, encryption, and access control, to safeguard the integrity and confidentiality of SIP communications.