get http://www.mega-nerd.com/libsndfile/files/libsndfile-1.0.28.tar.gz

https://voipnotes.ru/blog/commands-cli-freeswitch-fs-cli/

https://voxlink.ru/kb/asterisk-configuration/ustanovka-freeswitch-iz-ishodnikov-na-centos-7/

https://asterisk-pbx.ru/wiki/freeswitch/dp/fs_basic_gateways

https://www.powerpbx.org/content/fusionpbx-v44-freeswitch-v16-centos-v7-mariadb-apache-install-guide-v1

https://asterisk-pbx.ru/wiki/freeswitch/fusionpbx

http://voiplab.by/wiki/freeswitch/78-regulyarnye-vyrazheniya-regular-expression-freeswitch

https://zadarma.com/ru/support/instructions/freeswitch/

https://asterisk-pbx.ru/wiki/freeswitch/dp/fs_basic_gateways