Contact
The fastest way to reach me is email. I read every message, but reply times vary depending on what's on the production schedule that week.
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General inquiries
Feedback, corrections, errata, or general questions about the book.
info@seancheesman.com -
Permissions & licensing
Excerpting, translating, or republishing material from the book — same address, but mention "permissions" in the subject line.
Permissions request -
Consulting
Production VoIP troubleshooting engagements, SBC and SIP-trunk design review, or VoIP observability rollouts.
Consulting inquiry
Reporting errata
If you're emailing about something that looks wrong in the book, please include the page number, the section heading if you have it, and a brief description of the issue. That makes it possible to verify and post a correction quickly. Confirmed errata land on the errata page.