Version 89 (Adrian Georgescu, 12/01/2009 03:30 pm) → Version 90/177 (Adrian Georgescu, 12/01/2009 03:31 pm)

= 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 language
* Non-blocking asynchronous design
* Event driven Application Programming Interface
* TLS security for both signaling (SIP) and media planes (MSRP, XCAP)
* Fail-over for DNS lookups, SIP next hop routing and MSRP relay reservation
* Multiple SIP accounts support
* Multiple media types per session (e.g. Audio + Instant Messaging + Desktop Sharing)
* Multiple active session support with add/remove of media within same session
* Compatible with SIMPLE functionality of OpenSIPS and OpenXCAP servers
* Trace capability for all underlying protocols
* Cross platform (Linux, OSX, Windows)

== Location Discovery ==

* [ RFC3263] next hop resolution lookup
* Bonjour multicast DNS []
* 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 ==

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

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

== NAT Traversal ==

The client library 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 ==

* 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 ==

* 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 org.openmobilealliance.pres-rules, org.openmobilealliance.xcap-directory, 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]

== File Transfer ==

* MSRP file transfer [ RFC5547]

== Desktop Sharing ==

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

== Conferencing ==

* Conference event package [ RFC4575]
* MSRP ad-hoc multi-party chat sessions [ draft-ietf-simple-chat-05]