The 1.8 PDFs explain how to use mod_verto to allow web browsers to make/receive calls via WebSocket without any plugin. You will learn how to generate a self-signed SSL certificate and configure verto.conf.xml .
While the content is authoritative, user reviews highlight a mix of technical depth and editorial flaws: FreeSWITCH 1.8 | Cloud & Networking | eBook - Packt freeswitch 18 pdf
FreeSWITCH version 1.8 does not contain a PDF subsystem. However, robust integrations exist using ESL, HTTP APIs, and external converters. The phrase "freeswitch 18 pdf" most likely refers to either: robust integrations exist using ESL