Which RFC standards does this skill implement?

It focuses on RFC 4566 (SDP) for structure and syntax, and RFC 3264 (Offer/Answer Model) for the negotiation workflow.

Does this skill handle dynamic payload types?

Yes, the skill includes logic to register and negotiate dynamic codecs using rtpmap and fmtp attributes, allowing for flexible media handling beyond static defaults.

Is this skill compatible with WebRTC development?

While specifically tailored for SIP, the SDP parser and offer/answer logic are highly applicable to WebRTC signaling implementations that use SDP for session descriptions.

What is the primary role of SDP in SIP media negotiation?

SDP (Session Description Protocol) is used within SIP to describe the multimedia session, specifying codecs, transport protocols, and IP addresses for the media stream.

SIP Media Negotiation

Name: SIP Media Negotiation
Author: TheBushidoCollective

byTheBushidoCollective

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API Development

Negotiates media sessions and manages Session Description Protocol (SDP) for professional VoIP applications.

About

This skill provides specialized knowledge and implementation patterns for the Session Description Protocol (SDP) and the offer/answer model defined in RFC 3264. It empowers developers to build robust SIP-based communication systems by providing a comprehensive TypeScript SDP parser, managing codec registries for both static and dynamic payloads, and implementing the logic required to find common media parameters between endpoints. Whether building softphones, media gateways, or signaling bridges, this skill ensures optimal media session establishment and codec compatibility.

Key Features

Complete SDP parser and stringifier for RFC 4566 compliant session descriptions
Automated identification of common media capabilities and bandwidth parameters
Support for dynamic codec registration via rtpmap and fmtp attribute parsing
39 GitHub stars
Implementation of the SDP offer/answer model for seamless media negotiation
Comprehensive codec registry for standard audio and video payloads (PCMU, G722, G729, H264)

Use Cases

Implementing WebRTC-to-SIP bridges where codec mapping and session timing are critical
Developing a VoIP client or softphone that requires precise media capability negotiation
Building SIP proxies or back-to-back user agents (B2BUA) that must handle SDP mangling

About

Key Features

Complete SDP parser and stringifier for RFC 4566 compliant session descriptions
Automated identification of common media capabilities and bandwidth parameters
Support for dynamic codec registration via rtpmap and fmtp attribute parsing
39 GitHub stars
Implementation of the SDP offer/answer model for seamless media negotiation
Comprehensive codec registry for standard audio and video payloads (PCMU, G722, G729, H264)

Use Cases

Implementing WebRTC-to-SIP bridges where codec mapping and session timing are critical
Developing a VoIP client or softphone that requires precise media capability negotiation
Building SIP proxies or back-to-back user agents (B2BUA) that must handle SDP mangling