References
Inamdar, Kaustubh, Steve Holl, Gonzalo Salgueiro, Kyzer Davis, and Chidambaram Arunachalam. Understanding Session Border Controllers: Comprehensive Guide to Designing, Deploying, Troubleshooting, and Maintaining Cisco Unified Border Element (CUBE) Solutions. Hoboken: Cisco Press, 2018.
RFC 3261, “SIP: Session Initiation Protocol,” https://tools.ietf.org/html/rfc3261
RFC 3264, “An Offer/Answer Model with the Session Description Protocol (SDP),” https://tools.ietf.org/html/rfc3264
RFC 4566, “SDP: Session Description Protocol,” https://tools.ietf.org/html/rfc4566
RFC 5853, “Requirements from Session Initiation Protocol (SIP) Session Border Controller (SBC) Deployments,” https://tools.ietf.org/html/rfc5853