Asterisk

• https://dev.to/onmyway133/learning-voip-rtp-and-sip-aka-awesome-pjsip-9d1

• 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

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()