Erlang SIP and SDP library

Some time ago I found that there are no opensource SIP library that does not force you to some software design. All libraries provides some framework that is required in your project if you want to use SIP. I believe that this is wrong way. Goal of this project is to provide high-level primitives that implements all SIP functions but leave to user how to organize these primitives in his/her software.

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 idenification (completed)
- Non-INVITE transaction (completed)
- INVITE transaction (completed)
Registrar support (completed)
Parser limits enforcement (completed)
Statefull proxy support (completed)
Common dialog support (completed)
Authorization and proxy authorization (in-progress)
SDP support (in-progress)
INVITE dialog support
High-level UA support
Detailed documentation and tutorials

Realworld examples

Working examples:

Sateful SIP proxy: https://github.com/poroh/ersip_proxy

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 - in progress)
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 (patially - in progress)

About Author

Dmitry Poroh:

Has huge (17 years) exprience in telecommunication areas. Among other projects I have developed:

SMTP protocol (RFC2821)
HTTP/FTP proxy (RFC2616, RFC0959)
OSPF protocol (RFC2328)
ZigBee/IEEE 802.15.4 protocol stack
HTTP/HTTPS implementation (RFC2616)
DiffServ implementation
VPN (IPSec/ESP) tunnels implementation
RTP/RTCP implementation (RFC3550/RFC3551)

Also I have experience in VOIP area:

Private PBX implementation based on FreeSWITCH
Multipoint Control Unit (developed from scratch)
MSML-capable Audio Media Gateway (developed from scratch)
Session Border Controller (developed from scratch)