KNOWLEDGE BASE / 9NE.PL
Technical decisions
explained from the ground up.
Practical articles on VoIP, SIP, WebRTC, Linux, deployments and diagnostics. Clear explanations grounded in production environments.
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- Practical guides
7 articles
Advanced
WebRTC, ICE, STUN and TURN explained
How the browser chooses a media path, why a public candidate is not always enough and when TURN is necessary for a reliable connection.
Intermediate
Technical incident RCA — from symptom to lasting correction
A good RCA does not seek someone to blame or merely recount events. It connects evidence, the failure mechanism, impact, correction and actions that prevent recurrence.
Advanced
How to plan a PBX migration without uncontrolled downtime
A telephony platform migration needs parallel plans for configuration, registrations, routing, media, numbering, carriers and user behaviour.
Advanced
One-way audio in VoIP — NAT, RTP, SDP and firewalls
One-way audio is not a single problem. It is a class of failures involving signalling, address translation, media routing, ACLs and device behaviour.
Intermediate
How to read a SIP trace and identify why a call fails
A practical method for analysing SIP signalling: from Call-ID and transactions, through routing and headers, to SDP, media and a precise RCA.
Intermediate
Docker behind Nginx — TLS, health checks and predictable rollback
A lightweight production architecture for a web application: a locally accessible container, host Nginx, a certificate, readiness, versioned images and automatic rollback.
Intermediate
A safe production server migration, step by step
Migration does not start with copying files. It starts with an inventory, dependencies, acceptance criteria and a practical way back.
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