T12
Open alternatives
FreeSWITCH through Jami, then dates you confirm. 3 lessons. Each lesson cites the pages that were opened, and marks the rest confirm.
FreeSWITCH and Asterisk
T12-R34
Wikipedia says FreeSWITCH is free and open-source telephony software for audio, video, and text, with SIP features, and that it runs on Linu
Kamailio is a SIP server
T12-R35
Wikipedia says Kamailio, formerly OpenSER, is a GPL-licensed SIP server that can be a registrar, proxy, or redirect server.
LiveKit, Jitsi, Matrix, and Jami
T12-R36
Jitsi's handbook says Jitsi is a video conferencing platform built from open-source projects, and the article says the project hosts meet.ji
Sources and go deeper
Opened 2026-10. A row marked confirm has no link, because that page was not verified.
- RFC. RFC 3261, SIP last checked 2026-10
- Wikipedia. Session Initiation Protocol last checked 2026-10
- Wikipedia. Platform as a service, Communications platform as a service section last checked 2026-10
- Confirm. Release-specific menus for this track. confirm. Not opened as a single checklist. last checked 2026-10