[Freeswitch-users] Looking for libesl, headers, etc.

Antony Stone Antony.Stone at freeswitch.open.source.it
Tue Nov 9 14:51:18 UTC 2021

On Monday 08 November 2021 at 22:38:41, Telium Technical Support wrote:

> I built a Debian 9 based FreeSwitch+FusionPBX from packages.  I now want to
> create a simple C++ program talking to FS using the ESL.

Why are you building a Debian 9 system?  Debian 11 is the current stable 
release; security support for Debian 9 ended in July 202, and long-term 
support will end in June 2022.

> I can't find libesl on the system, nor header files.  Is this available as
> a separate download package?  Do I have to DL the whole FS source,
> compile, and pull that out?

According to the documentation at 
https://freeswitch.org/confluence/display/FREESWITCH/Event+Socket+Library "ESL 
(libesl) is a C library that has no dependencies on FreeSWITCH, and it can be 
built, and moved to client/remote machines."

Therefore I would expect you to be able to build it directly from


"Measuring average network latency is about as useful as measuring the mean 
temperature of patients in a hospital."

 - St├ęphane Bortzmeyer

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