The community is currently backporting "hot" modules from 1.10 to 1.8:
On your Debian 12 server running FreeSWITCH 1.10:
apt-get install wkhtmltopdf
# or for better HTML/CSS3 support:
pip3 install weasyprint
First, a clarification: The official version number remains 1.10.x. However, the community shorthand "FreeSWITCH 18" refers to the software running optimally on Debian 11 (Bullseye) or Ubuntu 22.04 LTS – environments using OpenSSL 3.0 and newer kernel modules. These OS versions, released around late 2021 to 2022, introduced breaking changes for older FreeSWITCH builds.
Why does this matter for your "hot PDF" use case? Because newer encryption libraries (TLS 1.3) and file I/O systems make generating secure, encrypted PDF reports from call data significantly faster and safer. freeswitch 18 pdf hot
Save this as /usr/local/freeswitch/scripts/hot_pdf.lua:
-- Hot PDF script - triggered via dialplan api = freeswitch.API() uuid = argv[1]; -- Call UUID caller_id = api:execute("getvar", "caller_id_number") dest_number = api:execute("getvar", "destination_number") start_epoch = api:execute("getvar", "start_epoch")-- Build HTML template html_template = [[ <html> <head><title>Call Receipt - FreeSWITCH 18</title></head> <body> <h1>Communication Log</h1> <p>Caller: ]] .. caller_id .. [[</p> <p>Destination: ]] .. dest_number .. [[</p> <p>Timestamp: ]] .. os.date("%Y-%m-%d %H:%M:%S", tonumber(start_epoch)) .. [[</p> <p>Status: HOT Transfer</p> </body> </html> ]]
-- Write temp HTML local html_file = "/tmp/cdr_" .. uuid .. ".html" local pdf_file = "/tmp/cdr_" .. uuid .. ".pdf" local f = io.open(html_file, "w") f:write(html_template) f:close() The community is currently backporting "hot" modules from 1
-- Execute conversion (hot generation) os.execute("wkhtmltopdf " .. html_file .. " " .. pdf_file)
-- Send PDF via email or HTTP (hot delivery) os.execute("curl -F 'file=@" .. pdf_file .. "' https://your-storage.com/upload")
While later versions focused on WebRTC and clustering, FreeSWITCH 1.8 hit a "sweet spot" for developers who need bare-metal PDF handling.
In /etc/freeswitch/directory/ create hotdesk_users.xml:
<include>
<user id="101" mailbox="101">
<params>
<param name="password" value="1234"/>
</params>
<variables>
<variable name="user_context" value="hotdesk"/>
<variable name="effective_caller_id_name" value="Alice Sales"/>
<variable name="email_pdf" value="alice@company.com"/>
</variables>
</user>
</include>
If you prefer a structured book format (PDF), the industry-standard books are published by Packt Publishing: First, a clarification: The official version number remains
Imagine a hot desking session: An employee logs into a shared phone, takes a sales call, then hangs up. FreeSWITCH automatically generates a Hot PDF of that call and emails it to the logged-in user – not the generic desk location. That's the "hot" synergy.