Voice over IP

Consists of the following components:

Asterisk server at asterix.srv.it-syndikat.org
HT802 analog phone interface connected to Bunkertelefon
Homeassistant VoIP integration
SIP trunk to EPVPN
SIP trunk to PSTN via sipcall

Asterisk

Runs on asterix.srv.it-syndikat.org.

Central PBX, talks to all other endpoints. Configuration happens mostly in /etc/asterisk/pjsip.conf and /etc/asterisk/extensions.conf.

CLI can be accessed using sudo -u asterisk asterisk -r. Useful commands:

reloading: reload to reload everything, pjsip reload/dialplan reload for partial reloads
delete stuck SIP registration: database show registrar/contact, then e.g. database deltree registrar/contact 6002;@332c500bfb09158a3a3a9ef53913cd6a
logging: pjsip set logger on to show SIP packets
dialplan help: core show applications/core show functions

EPVPN

Asterisk is registered in EPVPN on extension 1754. Outbound calls to EPVPN are possible with prefix 9, inbound calls go to Bunkertelefon.

sipcall

We have a prepaid sipcall phone number, +43 720 519629. Outbound calls to numbers starting with 0 are routed though here to PSTN. Inbound calls go to Bunkertelefon.

HT802

Analog Telephone Adapter for Bunkertelefon, registered on extension 6001.

Web interface on http://ht802.asozial.it-syndikat.org, credentials in Vaultwarden. Has a machine-friendly-ish SSH interface too.

Config export in voip/ht802/ directory.

Picking up and not dialling for 5 seconds automatically connects to Homeassistant.

Homeassistant

Native VoIP integration, registered on extension 6006.

Call deterrence

Because the Bunkertelefon is quite loud, whenever isitopen is closed, callers will first be greeted by a GLaDOS recording telling them to go away. Pressing 1 will make the phone ring anyway.

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