Version 139 (Adrian Georgescu, 04/18/2010 11:21 am) → Version 140/177 (Adrian Georgescu, 04/21/2010 11:52 pm)

= Features =

''SIP SIMPLE client SDK'' is a Software Development Kit for development of Real Time Applications based on SIP and related protocols for Audio, Instant Messaging, File Transfers, Desktop Sharing and Presence. Other media types can be easily added by using an extensible high-level API.

The library has cross platform capabilities on Linux OS, Mac OSX (Leopard and Snow Leopard) and Microsoft Windows (roadmap). The library should work with minimal changes on any platform that supports C and Python development environments. The SIP and media stacks are based on pjsip 1.0 version with relevant patches from later versions applied.

To see ''SIP SIMPLE client SDK'' features in action you can try [ Blink].

== General Features ==

* Written in Python Programming Language
* Non-blocking Asynchronous Engine
* High Level Middleware
* Configuration Framework
* TLS Security for signaling (SIP) and media (MSRP, XCAP)
* Multiple SIP Accounts support
* Multiple Media Types per Session (e.g. Audio + IM)
* Trace capability for all underlying protocols
* Failover for DNS lookups, SIP and MSRP routing
* Supports re-INVITE for adding and removing media
* Automatically handling if IP Address changes
* Audio Conference Bridge
* Wav Player and Recorder
* Acoustic Echo Cancelation (based on Speex MDF algorithm)
* Answering Machine
* Wide-band Internet codecs: Speex and G722
* PSTN compatible codecs: G711, iLBC, GSM

Supported media types:

* Audio (RTP/sRTP)
* Instant Messaging (MSRP)
* File Transfer (MSRP)
* Desktop Sharing (VNC over MSRP)

All media types can be combined together in the same SIP session.

The library uses a separated from the core lookup mechanism for the next hop routing. This important feature allows the library to be used for building SIP clients that operate in combination with any SIP provider (by employing RFC 3263 DNS lookups), in a server-less LAN operation (using Bonjour protocol) or integrated into a network overlay developed by a third party (e.g. P2PSIP overlay).

== Implemented Standards ==

=== SIP Signaling ===

* SIP, Session Initiation Protocol [ RFC3261]
* SDP, Session Description Protocol [ RFC4566]
* An Offer/Answer Model with Session Description Protocol (SDP) [ RFC3264]
* Reliability of Provisional Responses in Session Initiation Protocol [ RFC3262]
* HTTP Authentication: Basic and Digest Access Authentication [ RFC2617]
* The Reason Header Field for the Session Initiation Protocol [ RFC3326]

=== Address Resolution ===

* Locating SIP services: [ RFC3263]
* Bonjour multicast DNS: []

=== NAT Traversal ===

* SIP Signaling: Symmetric Response Routing Symmetric media [ RFC3581]
* STUN: Session Traversal Utilities for NAT [ RFC3489]
* RTP media (Audio and Video): ICE, Interactive Connectivity Establishment [ RFC5245]
* MSRP media (Instant Messaging and File Transfer): MSRP protocol relay extension [ RFC4976]

=== Voice over IP ===

* RTP, A Transport Protocol for Real-Time Applications [ RFC3550]
* Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP) [ RFC3605]
* The Secure Real-time Transport Protocol (SRTP) [ RFC3711]
* Generation and parsing of RFC 2833/telephone-events payload in both RTP and SDP [ RFC2833]

=== Instant Messaging ===

* Common Presence and Instant Messaging (CPIM): [ RFC 3862]
* Session Initiation Protocol (SIP) Extension for Instant Messaging [ RFC3428]
* MSRP Protocol [ RFC4975]
* Indication of Message Composition for Instant Messaging [ RFC3994]
* Message Summary Event Package [ RFC3842]
* File Transfer [ RFC5547]

=== Desktop Sharing ===

* Variation of [ draft-garcia-mmusic-sdp-collaboration-00] using RFB over MSRP

=== Conferencing ===

* Conference Event Package [ RFC4575]
* A Framework for Conferencing with the Session Initiation Protocol [ RFC4353] (work in progress)
* SIP Call Control - Conferencing for User Agents [ RFC4579] (work in progress)
* MSRP ad-hoc multi-party chat sessions [ draft-ietf-simple-chat-06] (work in progress)

=== Presence ===

All features have been tested against with [ OpenSIPS] Presence Agent and [ OpenXCAP] server.

* SIP Specific Event Notification (SUBSCRIBE and NOTIFY methods) [ RFC3265]
* SIP Extension for Event State Publication (PUBLISH method) [ RFC3903]
* Presence Data Model (PIDF) [ RFC3863], [ RFC3379], [ RFC4479]
* Watcher-info Event Package [ RFC3857], [ RFC3858]
* Rich Presence Extensions to PIDF [ RFC4480]
* Contact Information Extension to PIDF [ RFC4482]
* User Agent Capability Extension to PIDF [ RFC5196]
* XCAP Protocol [ RFC4825]
* Common Policy [ RFC4745]
* Presence Rules [ RFC5025]
* Resource Lists [ RFC4826]
* RLS Services [ RFC4826]
* PIDF manipulation [ RFC4827]
* XCAP Diff [ draft-ietf-simple-xcap-diff-14]
* OMA specification org.openmobilealliance.xcap-directory
* OMA specification oma_status.icon