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sip-protocol-fundamentals

@TheBushidoCollective/han
38
0

Use when working with SIP messages, methods, call flows, and protocol fundamentals for VoIP applications.

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SKILL.md

name sip-protocol-fundamentals
description Use when working with SIP messages, methods, call flows, and protocol fundamentals for VoIP applications.
allowed-tools Bash, Read

SIP Protocol Fundamentals

Master the Session Initiation Protocol (SIP) for building VoIP applications, understanding SIP messages, methods, and call flows essential for real-time communications.

Understanding SIP

SIP is an application-layer signaling protocol defined in RFC 3261 for creating, modifying, and terminating sessions with one or more participants.

SIP Message Structure

INVITE sip:bob@biloxi.com SIP/2.0
Via: SIP/2.0/UDP pc33.atlanta.com;branch=z9hG4bK776asdhds
Max-Forwards: 70
To: Bob <sip:bob@biloxi.com>
From: Alice <sip:alice@atlanta.com>;tag=1928301774
Call-ID: a84b4c76e66710@pc33.atlanta.com
CSeq: 314159 INVITE
Contact: <sip:alice@pc33.atlanta.com>
Content-Type: application/sdp
Content-Length: 142

When to Use This Skill

Use sip-protocol-fundamentals when building VoIP applications with SIP signaling.

Best Practices

  • Always include unique branch parameters in Via headers
  • Implement proper transaction timeout and retransmission
  • Handle all SIP response codes appropriately

Common Pitfalls

  • Forgetting to include branch parameter in Via headers
  • Not implementing transaction retransmission timers
  • Ignoring provisional responses

Resources