====== VOIP ======
    Telephony: Twilio
    SMS: XMPP server
    Voice: Asterisk
    ## VitalPBX: GUI interface for Asterisk
    ## Connect PBX to SIP trunk service (voip.ms or telnxy free $15 to begin)
    ## Zoiper connects to the PBX

==== PROSODY ====

=== INSTALLATION ===

    $ sudo apt install golang-go
    $ sudo apt install prosody net-tools
    $ sudo systemctl enable prosody
    $ sudo systemctl start prosody
    $ sudo systemctl status prosody
        ## ● prosody.service - Prosody XMPP Server
        ##    Loaded: loaded (/lib/systemd/system/prosody.service; enabled; vendor preset: enabled)
        ##    Active: active (running) since Fri 2021-05-14 19:48:18 MDT; 12min ago
        ##      Docs: https://prosody.im/doc
        ##  Main PID: 4626 (lua5.2)
        ##     Tasks: 1 (limit: 4915)
        ##    Memory: 4.4M
        ##    CGroup: /system.slice/prosody.service
        ##            └─4626 lua5.2 /usr/bin/prosody

    $ sudo netstat -lnptu | grep lua
        ## tcp        0      0 0.0.0.0:5222            0.0.0.0:*               LISTEN      4626/lua5.2         
        ## tcp        0      0 0.0.0.0:5269            0.0.0.0:*               LISTEN      4626/lua5.2         
        ## tcp6       0      0 :::5222                 :::*                    LISTEN      4626/lua5.2         
        ## tcp6       0      0 :::5269                 :::*                    LISTEN      4626/lua5.2      
        ## PORT 5222: client to server
        ## PORT 5269: server to server

=== CONFIGURATION ===

    $ sudo nano /etc/prosody/prosody.cfg.lua
    < /etc/prosody/prosody.cfg.lua >    

==== TWILIO ====

=== INSTALLATION ===

    ## Create API key
    https://www.twilio.com/console/sms/dev-tools/api-keys
    ## FRIENDLY NAME
    ## ss
    ## SID
    ## SK72dd03ffbc054e24288bc3937a8500f8
    ## KEY TYPE
    ## Standard
    ## SECRET
    ## JWTdCr8O0d3oYj10enwaWlZltjuT6uPr

    References:
    https://mndrix.blogspot.com/2017/02/selfhosted-google-voice.html
    https://www.linuxbabe.com/ubuntu/install-configure-prosody-xmpp-server-ubuntu-20-04
    https://prosody.im/doc/configure
    https://prosody.im/doc/components#adding_an_external_component
    https://github.com/AGWA/sms-over-xmpp
    https://www.twilio.com/docs/sms/send-messages#include-media-in-your-messages
    https://console.twilio.com/?frameUrl=/console/phone-numbers/verified
    https://console.twilio.com/?frameUrl=/console/phone-numbers/incoming
    https://console.twilio.com/us1/monitor/logs/sms?frameUrl=%2Fconsole%2Fsms%2Flogs%3F__override_layout__%3Dembed%26bifrost%3Dtrue%26x-target-region%3Dus1&currentFrameUrl=%2Fconsole%2Fsms%2Flogs%3F__override_layout__%3Dembed%26bifrost%3Dtrue