Protocol & Infrastructure
Session Border Controller Solutions
An SBC is the firewall, router, and translator of the voice world. We deploy SBCs on Kamailio + rtpengine, OpenSIPS + rtpengine, FreeSWITCH, and commercial platforms (Oracle ACME, AudioCodes, Sansay) — whichever fits your compliance, scale, and budget. Our work covers SIP normalization (because carriers don't send what RFC 3261 says they should), topology hiding (your PBX's IP should never leak to a peering partner), DoS protection (you will be scanned), and media anchoring (so NAT traversal and SRTP/RTP transcoding just work). We also handle the deployment fundamentals: HA pairs, region redundancy, and the monitoring that catches a slow-build DoS before it reaches your PBX.
Who it's for
- ITSPs peering with multiple carriers needing SIP normalization
- Enterprises exposing PBX to the internet for remote workers
- Platforms needing SRTP-to-RTP transcoding at carrier volumes
- Operators hit by SIP scanning and targeted DoS attacks
Our approach
- 1Start with a threat model — what attacks are we actually defending against?
- 2Normalize inbound SIP before it reaches your PBX — every quirk becomes predictable
- 3Pair signaling and media concerns separately — Kamailio handles SIP, rtpengine handles media
- 4Deploy in HA pairs with keepalived or BGP-based failover
- 5Instrument SIP session rates, dialog timeouts, and media quality end-to-end
What you get
SBC architecture document covering signaling, media, and failover topology
SIP normalization rules matched to your actual carrier interop matrix
rtpengine cluster sized for your codec mix with CPU/bandwidth headroom
DoS protection via pike module, fail2ban, or dedicated anti-DoS upstream
HA failover verified by simulated outage — not just theory
Operational runbook for SIP scanner storms, media one-way, and carrier flap
Common questions
Related services
Kamailio Development
Dispatcher tuning, SIP routing logic, and Kamailio-as-SBC deployments for carrier platforms.
OpenSIPS Development
OpenSIPS routing, load balancing, and SBC deployments with full control-plane integration.
VoIP Consulting
Architecture reviews, vendor evaluations, and on-call expert access for teams running voice infrastructure.
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