Senior VoIP engineering, written first
Zypager was created to provide focused, senior-level VoIP engineering support for companies that need written, precise and practical answers to complex voice problems.
Senior VoIP Engineer
Founder, Zypager
Experience across the whole voice path
VoIP/SIP engineering with Asterisk, FreeSWITCH, Kamailio, OpenSIPS and RTPengine; SIP trunks and carrier-grade troubleshooting; contact-centre infrastructure; Linux; production incident analysis; complex call flows; and hands-on SIP/RTP debugging.
A written-first troubleshooting style
Many companies waste time in calls without evidence. Zypager works from call examples, SIP traces, configuration snippets, symptoms and architecture notes, and returns clear written findings, likely root causes and practical next steps — precise, reviewable and easy to act on.
Practical engineering, not generic consultancy
The focus is root cause: diagrams, traces and evidence. Signalling is separated from media; assumptions are tested against what the trace actually shows; and recommendations are concrete and implementable.
Working on live systems. Zypager provides technical consultancy and troubleshooting guidance. Work involving live production systems may require appropriate access, backups, change control and approval from the system owner. Please redact passwords, tokens and personal data before sending logs or SIP traces where possible.