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Session Border Controller Explained: Securing the VoIP Edge
A Session Border Controller, or SBC, sits at the boundary between an organization's voice network and the public internet or carrier networks. It controls and secures SIP traffic crossing that boundary.
Core Functions
SBCs provide security by hiding internal network topology, filtering malformed SIP messages, and blocking denial-of-service attacks. They normalize SIP signaling between different vendor implementations, solving interoperability problems between carriers and PBX platforms.
When You Need an SBC
Organizations with internet-exposed SIP trunking, multiple carrier connections, or strict security requirements benefit from an SBC. It is standard architecture for enterprises connecting voice to untrusted networks.
Carrier Demarcation
The SBC creates a clear boundary between the enterprise and service provider. It manages routing, transcoding, and policy enforcement at the network edge.
High Availability
Enterprise SBCs deploy in redundant clusters so the voice edge does not become a single point of failure.
Redstone offers SBC solutions that integrate with REX deployments to provide hardened edge security.
Redstone Systems, Inc. founded in Delaware, USA in December 2002, has been the ODM vendor for many well-known communications companies, serving the Southeast Asian market. In 2020, Redstone Systems will begin to return to the North America market with its self-developed brand.
Redstone has a complete product line of intelligent voice gateways, providing IP-PBXs, analog VoIP gateways (FXS/FXO), digital VoIP gateways (E1/T1), border appliances, and session boundary controllers (SBCs).
With advanced technology in digital signal processor (DSP), speech coding and speech processing, as well as efficient operational tools such as cloud remote management, auto provisioning, Redstone gateways are widely used in markets of enterprise communications, cloud communications, call centers, operators’ IMS/SIP trunks, bringing users friendly, efficient and reliable communication experience.
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