Library

Specifications, schema references, and the documents we keep coming back to.

Core references

• RFC 6716 — Definition of the Opus audio codec.
• RFC 3550 — RTP: the transport every real-time media stream rides on.
• RFC 3261 — SIP: Session Initiation Protocol.
• RFC 6120 — XMPP core.

Historical material

This domain previously hosted documentation for the E-Speak service framework, including its transport schema and programming guide. Those documents are being restored where the originals can be recovered; where they cannot, we publish notes describing what they covered.

Available here

• Protocol comparison sheets.
• Codec bitrate and delay tables.
• Notes on interoperability between SIP and WebRTC gateways.