Bill-IT
Bill-IT
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SBC Expertise

The Session Border Controller, central element of VoIP security

What is an SBC

The Session Border Controller (SBC) is a specialized network device that controls signaling and media flows at voice network boundaries. It acts as an application-layer firewall for SIP, H.323 and RTP protocols, ensuring security, interoperability and quality of service for unified communications.

What is an SBC

Key functions

SIP access control

Session authentication and authorization. Filtering by IP address, domain, trunk, with limits on concurrent sessions and bandwidth.

Topology hiding

Rewriting SIP headers (Via, Contact, Route, Record-Route) and SDP information to completely conceal the internal network structure from external partners.

Protocol translation

Interoperability between equipment from different vendors. SIP variant conversion, codec adaptation and signaling transformation for compatibility.

Quality management

Bandwidth control, voice flow prioritization (QoS/ToS), load management and session distribution across multiple servers or carriers.

Advanced security

Protection against DoS/DDoS attacks, SIP anomaly detection, per-source rate limiting, blacklists/whitelists and SIP message compliance validation.

High availability

Active/standby or active/active cluster operation. Automatic failover with no session loss, state synchronization and continuous monitoring.

Deployment contexts

The SBC is deployed in many scenarios: SIP carrier interconnection, SIP trunk security, enterprise peering, unified communications integration (UCaaS), traditional PBX migration and existing architecture compliance.

Oracle SBC

The Oracle Session Border Controller (formerly Acme Packet) is the market reference for enterprise and carrier environments. It offers fine-grained management of realms, SIP interfaces, session agents, routing policies and security profiles. Bill-IT has deep expertise on this platform.

  • -Multi-zone realms and SIP interfaces
  • -Session agents and advanced routing policies
  • -TLS profiles and certificate management
  • -SIP manipulations (header manipulation rules)
  • -Codec policies and media management
  • -1+1 high availability
  • -SNMP monitoring and CDR

SBC vs traditional firewall

A traditional firewall does not understand the SIP protocol. It cannot inspect SIP messages, manage dynamic media port opening or hide internal topology. The SBC is a specialized application firewall that understands voice protocol semantics and operates at the session level, not just the packet level.