18 Pdf _top_: Freeswitch

Report: FreeSWITCH Status and Developments (circa 2018)

3.3 mod_xml_cdr to PDF Conversion

Configure autoload_configs/xml_cdr.conf.xml to save CDRs as XML.
Run a cron job that transforms XML → HTML → PDF using xsltproc and wkhtmltopdf.

3.1 Using Event Socket Library (ESL)

Connect an external program (Python/Perl) to FreeSWITCH’s ESL, listen for events (e.g., CHANNEL_ANSWER, CHANNEL_HANGUP_COMPLETE), and generate a PDF report.

Example (Python pseudocode):

from ESL import ESLconnection
from reportlab.pdfgen import canvas
conn = ESLconnection("localhost", "8021", "ClueCon")
if conn.connected():
conn.events("plain", "CHANNEL_HANGUP_COMPLETE")
while True:
e = conn.recvEvent()
if e:
cdr_data = 
"caller": e.getHeader("Caller-Caller-ID-Number"),
"duration": e.getHeader("variable_duration")
# Generate PDF
c = canvas.Canvas("call_report.pdf")
c.drawString(100, 750, f"Call from cdr_data['caller']")
c.save()
 freeswitch 18 pdf

5. Official FreeSWITCH 1.8 Documentation (PDF)

The FreeSWITCH team provides an official book in PDF format:
"FreeSWITCH 1.8" by Anthony Minessale (Packt Publishing) Report: FreeSWITCH Status and Developments (circa 2018) 3

ISBN: 9781788622924
Covers: Installation, XML dialplan, ESL, WebRTC, conferencing, and troubleshooting.
Not a reference for PDF generation – it documents the telephony engine itself.

You can obtain the PDF from:

Packt Publishing website (paid)
FreeSWITCH official documentation archive (free user guide, not the full book)