# Open telephony bridges

- A SIP trunk joins two dial plans. It does not merge them.
- SIPconnect is the SIP Forum recommendation for provider peering.
- Asterisk and FreeSWITCH are separate PBXs with their own dialplans.
- WebRTC is a browser API plus the protocol suite in RFC 8825. SIP over WebSocket is RFC 7118.
- A CPaaS vendor matrix was not opened. Confirm a vendor on that vendor's page.

## Sources and go deeper

Independent, free, learning-only student project.

Opened 2026-10. A row marked confirm has no link, because that page was not verified.

- Wikipedia. [SIP trunking (Wikipedia)](https://en.wikipedia.org/wiki/SIP_trunking). last checked 2026-10
- SIP Forum. [SIPconnect technical recommendation](https://www.sipforum.org/technology/sipconnect/). last checked 2026-10
- RFC. [RFC 3261, SIP](https://www.rfc-editor.org/rfc/rfc3261). last checked 2026-10
- Cisco. [Cisco Unified Communications Manager product support](https://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/series.html). last checked 2026-10
- Cisco. [System Configuration Guide for CUCM, Release 15](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15.html). last checked 2026-10
- Wikipedia. [Asterisk (Wikipedia)](https://en.wikipedia.org/wiki/Asterisk_(PBX)). last checked 2026-10
- Asterisk. [Types of Asterisk modules](https://docs.asterisk.org/Fundamentals/Asterisk-Architecture/Types-of-Asterisk-Modules/). last checked 2026-10
- Asterisk. [Configuring res_pjsip](https://docs.asterisk.org/Configuration/Channel-Drivers/SIP/Configuring-res_pjsip/). last checked 2026-10
- Wikipedia. [FreeSWITCH (Wikipedia)](https://en.wikipedia.org/wiki/FreeSWITCH). last checked 2026-10
- FreeSWITCH. [FreeSWITCH users manual](https://developer.signalwire.com/freeswitch/). last checked 2026-10
- Wikipedia. [WebRTC (Wikipedia)](https://en.wikipedia.org/wiki/WebRTC). last checked 2026-10
- WebRTC. [W3C WebRTC recommendation](https://www.w3.org/TR/webrtc/). last checked 2026-10
- RFC. [RFC 8825, WebRTC protocol overview](https://www.rfc-editor.org/rfc/rfc8825). last checked 2026-10
- RFC. [RFC 8829, JavaScript session establishment](https://www.rfc-editor.org/rfc/rfc8829). last checked 2026-10
- RFC. [RFC 7118, SIP over WebSocket](https://www.rfc-editor.org/rfc/rfc7118). last checked 2026-10
- WebRTC. CPaaS vendor matrix. confirm. No vendor matrix was opened. The FreeSWITCH manual notes one hosted platform. Confirm any other vendor on that vendor's own page. last checked 2026-10

Room or sheet file: sources/bridges/sources.json