Version 93 (Adrian Georgescu, 12/02/2009 12:11 pm) → Version 94/177 (Adrian Georgescu, 12/10/2009 08:28 am)

= Library Features =

[[TOC(WikiStart, Sip*, depth=2)]]

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

The software has undergone in the past years several interoperability tests at [ SIPIT] and today is of industry strength quality.

== General Features ==

* Written in Python programming language
* Non-blocking Asynchronous Design asynchronous design
* Event Driven driven Application Programming Interface
* TLS Security security for both signaling (SIP) and media planes (MSRP, XCAP)
* Failover Fail-over for DNS lookups, SIP next hop routing and MSRP relay reservation
* Multiple SIP Accounts Support accounts support
* Multiple Media Types media types per session (e.g. Audio + Instant Messaging + Desktop Sharing)
* Multiple Active Sessions active session support with add/remove of media within same session
* Trace Capability for underlying protocols
Compatible with SIMPLE functionality of OpenSIPS and OpenXCAP servers

The library has cross

* Trace capability for all underlying protocols
* Cross
platform capabilities capability on Linux OS, Mac Linux, 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. (roadmap)

== Location Discovery ==

* [ RFC3263] next hop resolution lookup
* Bonjour multicast DNS [] (not implemented yet)
* Other lookup mechanisms can be easily added (e.g. P2PSIP or DHT)

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).

== SIP Transport ==

* Automatically handles changes of System IP Address
Session Initiation Protocol [ RFC3261]
* Support for UDP, TCP and TLS transports

== SDP Negotiation ==

* Session Description Protocol [ RFC4566]
* An Offer/Answer Model with Session Description Protocol (SDP) [ RFC4566]
* Support of re-INVITE for adding and removing media streams

Supported media types:

* Audio/VoIP Audio (RTP/sRTP with or without ICE and STUN)
* Instant Messaging messaging over MSRP (with or without MSRP relay support)
* File Transfer transfer over MSRP (with or without MSRP relay support)
* Desktop Sharing sharing (VNC over MSRP)

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

== NAT Traversal ==

The client library supports the support best NAT traversal techniques available today:

* SIP Signaling: Symmetric Response Routing Symmetric media [ RFC3581] and Keep-alive
* Audio: STUN - Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators (NATs) [ RFC3489] and Interactive Connectivity Establishment (ICE): A Methodology for NAT Traversal for Offer/Answer Protocols [ draft-ietf-mmusic-ice-19]
* IM and File Transfer: MSRP protocol relay extension [ RFC4976]

== Audio ==

* A Transport Protocol for Real-Time Applications [ RFC3550]
* Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP) [ RFC3605]
* Generation and parsing of RFC 2833/telephone-events payload in both RTP and SDP [ RFC2833]
* The Secure Real-time Transport Protocol (SRTP) [ RFC3711]
* Echo cancelation control
* Hold
* DTMF tone generator
* Conference bridge
* Wav player and recorder
* RTP timeout detection
* Codecs: speex, g711, ilbc, gsm, g722

== Presence ==

All features have been built-in and tested with [ OpenSIPS] Presence Agent.

* SIP Specific Event Notification [ RFC3265]
* Presence data model [ RFC3863], [ RFC3379], [ RFC4479]
* Rich presence extensions [ RFC4480], [ RFC4481], [ RFC4482], [ RFC5196]
* Watcher-info [ RFC3857], [ RFC3858]
* Policy [ RFC4745]

== XCAP ==

All features have been built-in and tested with [ OpenXCAP] server.

* XCAP protocol [ RFC4825]
* Presence rules [ RFC5025]
* Resource-lists [ RFC4826]
* RLS-services [ RFC4826]
* PIDF manipulation [ RFC4827]
* xcap-diff [ draft-ietf-simple-xcap-diff-09]
* OMA specifications org.openmobilealliance.xcap-directory and oma_status.icon

== 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] (not implemented yet)

== File Transfer ==

* MSRP file transfer [ RFC5547] (partial sending not implemented yet)

== Desktop Sharing ==

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

== Conferencing ==

* Conference event package [ RFC4575] (not implemented yet)
* MSRP ad-hoc multi-party chat sessions [ draft-ietf-simple-chat-05] (not implemented yet)