====== Asterisk ======
  * Asterisk™: Полное руководство, 5-е издание https://translaster.github.io/Definitive-Guide-5th-Edition/glava-19.html
  * справочник https://xa0t3k.me/files/SIP/protokol-sip-spravochnik.pdf
  * sip cheat sheet https://xa0t3k.me/files/SIP/sip_cheatsheet.html#INVITEmsg

===== VoIP базовая информация, библиотеки, задачи =====
  * https://dev.to/onmyway133/learning-voip-rtp-and-sip-aka-awesome-pjsip-9d1
  * voice recognition https://github.com/antirek/ding-dong


===== Docker =====
  * https://github.com/andrius/asterisk - base image
  * https://appfleet.com/blog/serverless-asterisk-with-docker-and-aws-fargate/

===== Asterisk настройка и работа =====
  * Asterisk Docker - https://www.youtube.com/watch?v=54PIFPgnQLc
  * Asterisk management by AMI/AGI/ARI https://voxlink.ru/webinars/asterisk-ami-webinar/
  * PJSIP https://www.youtube.com/watch?v=4oqBUZQphIY
  * http://samag.ru/archive/article/2017 - все что хотели знать про sip
  *  http://weissvogel.blogspot.com/2019/08/asterisk-docker.html
  * http://wiki.pro-voip.ru/asterisk/nat-sip-i-asterisk.html
  * https://serveradmin.ru/nastroyka-servera-telefonii-asterisk-s-nulya/#Nastrojka_sip_trunk_tranka_i_dobavlenie_nomera


===== Asterisk call debug =====
  * http://asterisk.ru/knowledgebase/debug
  * https://serveradmin.ru/analiz-sip-trafika-v-asterisk-s-pomoshhyu-sngrep/
  * https://voxlink.ru/kb/asterisk-configuration/operativnaya-diagnostika-sip-v-konsoli-asterisk-kanaly-pjsip-i-chan_sip/

===== Pjsip =====
  * https://github.com/starkovv/asterisk-pjsip-visual-diagram/blob/master/pjsip_dot_conf_diagram.png
  * https://voxlink.ru/kb/asterisk-configuration/opisanie-parametrov-konfiguracii-pjsip-v-asterisk-s-primerami/
  * trouble shooting https://voxlink.ru/kb/asterisk-configuration/operativnaja-diagnostika-sip-v-konsoli-asterisk-kanaly-pjsip-i-chan_sip/
<code>
exten => _001X.,n,Set(PJSIP_MEDIA_OFFER(audio)=!all,g729)
exten => _001X.,n,Set(PJSIP_SEND_SESSION_REFRESH()=invite)
exten => _001X.,n,Dial(PJSIP/Aside/sip:${EXTEN}@ip:5060,b(out-pre-dial,s,1))

[out-pre-dial]
exten => s,1,NOOP(Pre dialer)
exten => s,n,Set(PJSIP_SEND_SESSION_REFRESH()=invite)
exten => s,n,Return()
</code>


===== Asterisk.Agi =====
  * Asterisk Agi python https://www.sanog.org/resources/sanog32/SANOG32_Conference-AGI_Scripting_in_Python-Morshed_Alam.pdf

===== Asterisk.ARI =====
  * voice recognition https://github.com/antirek/ding-dong
  * voicer http://nodejsasterisk.blogspot.com/