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RFC_COMPLIANCE.md

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RFC Compliance Documentation

This document details how the SIPREC server implementation adheres to the relevant SIP and SIPREC RFCs.

Supported RFCs

The server implements the following RFCs:

RFC 6341 - Basic Session Recording Protocol

This RFC defines the session recording metadata model for SIP.

Implementation Details:

  • Metadata Structure: The RecordingSession and related structs include all required fields from RFC 6341
  • Participant Information: Complete participant metadata including roles, identifiers, and streams
  • Security Mechanisms: Certificate and identity handling for recording entities
  • Extended Metadata: Support for additional metadata fields defined in the standard

RFC 7245 - Session Initiation Protocol (SIP) Common Log Format

This RFC defines the mechanisms for session continuity in SIP-based communications.

Implementation Details:

  • Dialog Replication: Full implementation of dialog replication for recovery
  • Replaces Header: Complete support for SIP Replaces header mechanism
  • Session Recovery: Method for recovering sessions after network failures
  • Failover IDs: Consistent failover ID handling across session transitions

RFC 7865 - Session Initiation Protocol (SIP) Recording Metadata

This RFC defines the metadata format for SIP-based recording sessions.

Implementation Details:

  • Metadata Format: Implementing the rs-metadata+xml format
  • SDP Handling: Proper SDP negotiation for recording sessions
  • Recording Controls: Start, stop, pause capabilities for recordings
  • Participant Structure: Correct modeling of participants in recordings

RFC 7866 - Session Recording Protocol

This RFC defines the protocol operations for establishing, maintaining, and terminating recording sessions.

Implementation Details:

  • SIP Call Flows: Implementation of required SIP message sequences
  • Recording Session Establishment: Protocol for initiating recording sessions
  • Media Stream Handling: Management of media streams in accordance with the spec
  • Notification Mechanisms: Implementation of state change notifications

Key Components

The implementation consists of several key components that work together to ensure RFC compliance:

1. SIP Layer (pkg/sip)

The SIP layer handles:

  • SIP dialog management
  • Transaction processing
  • State maintenance
  • Protocol operations

2. SIPREC Layer (pkg/siprec)

The SIPREC layer provides:

  • SIPREC metadata generation and parsing
  • Session recording association
  • Participant management
  • Stream identification

3. Session Redundancy (pkg/siprec/session.go)

The redundancy implementation ensures:

  • Session state persistence across failures
  • Dialog recovery mechanisms
  • Media stream continuity
  • Replaces header handling

Deviation Notes

While the implementation aims for full compliance, there are a few areas where it deviates from or extends beyond the RFCs:

  1. Storage Backend: The RFC does not specify a storage mechanism for session state. Our implementation provides a pluggable storage backend with an in-memory default.

  2. Expiration Handling: We've implemented more aggressive session expiration monitoring than required by the RFCs to improve resource management.

  3. Extensions: Additional metadata fields beyond the RFC requirements are supported for enhanced functionality.

Testing and Verification

Compliance with the RFCs has been verified through:

  1. Unit Tests: Tests for each component to verify correct behavior
  2. End-to-End Tests: Full flow tests that simulate real-world scenarios
  3. RFC Test Cases: Implementation of the test cases described in the RFCs

Future Enhancements

Planned enhancements to improve RFC compliance:

  1. Distributed Storage: Support for Redis and other distributed storage systems
  2. TLS for Signaling: Enhanced TLS support for secure signaling
  3. SRTP for Media: Full SRTP implementation for secure media transport
  4. Additional Event Notifications: Enhanced event notification mechanisms