Erlang SIP and SDP library

Documentation

Full module documentation is available here.

Approach to design

What you cannot find in ersip:

• Supervisors
• Servers
• ETS
• Dependencies

You can find only pure functions that are compliant to SIP specification.

Real world examples

Working examples:

• Stateful SIP proxy: https://github.com/poroh/ersip_proxy
• Hunt group service (B2BUA) example: https://github.com/poroh/piraha

Provided primitives

Primitives that provided by SIP stack:

• Connection parser split streams and retrieve low level SIP messages (ersip_conn)
• Low level SIP message processing (ersip_msg)
• Lazy high-level SIP message processing (ersip_sipmsg)
• Transactions support (ersip_trans)
• Basic UAS support (ersip_uas)
• Registrar function support (ersip_registrar)
• SIP stateful proxy function support (ersip_proxy)
• SIP common dialog support (ersip_dialog)

Supported RFC

RFC supported in this SIP stack:

• RFC 2543 SIP: Session Initiation Protocol (backward compatibility)
• RFC 3261 SIP: Session Initiation Protocol (partially):
  • 7 SIP Messages
  • 8.2 UAS Behavior
  • 9 Canceling a Request
  • 10 Registration - Registrar part only
  • 12 Dialogs
  • 16 Proxy Behavior
  • 17 Transactions
  • 18 Transport
  • 19 Common Message Components
• RFC 3262 Reliability of Provisional Responses in the Session Initiation Protocol (SIP)
  • 6 Definition of the PRACK Method
  • 7 Header Field Definitions
  • 7.1 RSeq
  • 7.2 RAck
• RFC 6026 Correct Transaction Handling for 2xx Responses to Session Initiation Protocol (SIP) INVITE Requests
• RFC 3581 An Extension to the Session Initiation Protocol (SIP) for Symmetric Response Routing (rport)
• RFC 4475 Session Initiation Protocol (SIP) Torture Test Messages
• RFC 5118 Session Initiation Protocol (SIP) Torture Test Messages for Internet Protocol Version 6 (IPv6)
• RFC 4566 SDP: Session Description Protocol (partially)
• RFC 3515 The Session Initiation Protocol (SIP) Refer Method (header/method only):
  • 2.1 The Refer-To Header Field
• RFC 6665 SIP-Specific Event Notification (header/method only)
  • 8.2.1. "Event" Header Field
  • 8.2.3. "Subscription-State" Header Field
• RFC 3891 The Session Initiation Protocol (SIP) "Replaces" Header (header only)
  • 6.1. The Replaces Header

License

MIT

Roadmap

• Basic low-level parser (completed)
• Essential headers support (completed)
• High-level SIP message (completed)
• Stateless proxy support (completed)
  • Request passing (completed)
  • Response passing (completed)
• Transaction support (completed)
  • Transaction identification (completed)
  • Non-INVITE transaction (completed)
  • INVITE transaction (completed)
• Registrar support (completed)
• Parser limits enforcement (completed)
• Stateful proxy support (completed)
• Common dialog support (completed)
• SDP support (completed)
• Detailed documentation and tutorials
• Authorization and proxy authorization
• INVITE dialog support
• High-level UA support