The VOIXYS blog
Practical insights on VoIP, softswitch architecture and open-source telecom—from Class 4 routing and CGRateS billing to SIP trunking security and self-hosting. Notes from the team building VOIXYS.
Class 4 vs Class 5: what's the difference?
Featured · 3 June 2026 · 8 min read
Wholesale transit and subscriber services solve very different problems—yet they're often confused. We break down what a Class 4 switch actually does (routing minutes between carriers at scale), how a Class 5 switch differs (delivering features to end users), and why VOIXYS runs both layers on a single open-source stack.
Latest articles
Hands-on guides and engineering notes from running a carrier-grade open-source switch.
Why we built billing on CGRateS
28 May 2026 · 6 min
Real-time rating, prepaid balances and multi-currency CDRs without a black-box billing vendor—how CGRateS fits our stack.
Read more → RoutingCutting termination costs with least-cost routing
21 May 2026 · 7 min
Quality-weighted LCR, carrier failover and ASR/ACD thresholds—practical tactics to lower per-minute cost without hurting call quality.
Read more → Self-hostingSelf-hosting your VoIP softswitch: a checklist
14 May 2026 · 9 min
Sizing, kernel tuning, NAT and media handling, monitoring and backups—everything to get right before you carry production traffic.
Read more → SecuritySIP trunking security best practices
7 May 2026 · 6 min
IP allow-lists, registration auth, fraud detection and TLS/SRTP—hardening trunks against toll fraud and SIP scanning.
Read more → NumbersNumber porting without downtime
30 April 2026 · 5 min
Coordinating LOAs, port windows and fallback routing so subscribers keep their numbers—and their calls—through the switchover.
Read more → Open sourceKamailio + FreeSWITCH: how the pieces fit
23 April 2026 · 8 min
Why we split SIP signalling from media: Kamailio as the routing brain, FreeSWITCH for B2BUA, IVR and transcoding.
Read more →More articles coming soon — subscribe via our contact page to get notified.
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From least-cost routing to billing, we build and operate the switch—so you can focus on selling minutes and features.