SIP SIMPLE Client SDK

= Features =

<abbr title="WikiStart, Sip*, depth=2">TOC</abbr>

''SIP SIMPLE client SDK'' is a Software Development Kit for development of Real Time Applications based on SIP and related protocols for media transport like Presence, Audio and Instant Messaging (IM). 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 [http://www.sipit.net SIPIT] and today is of industry strength quality. The SIP stack is provided by [http://www.pjsip.org PJSIP].

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.

To see ''SIP SIMPLE client SDK'' features in action you can try [http://icanblink.com 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 * 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 [http://tools.ietf.org/html/rfc3261 RFC3261]
• SDP, Session Description Protocol [http://tools.ietf.org/html/rfc4566 RFC4566]
• An Offer/Answer Model with Session Description Protocol (SDP) [http://tools.ietf.org/html/rfc3264 RFC3264]
• Reliability of Provisional Responses in Session Initiation Protocol [http://tools.ietf.org/html/rfc3262 RFC3262]
• HTTP Authentication: Basic and Digest Access Authentication [http://tools.ietf.org/html/rfc2617 RFC2617]
• The Reason Header Field for the Session Initiation Protocol [http://tools.ietf.org/html/rfc3326 RFC3326]

=== Location Discovery ===

• [http://tools.ietf.org/html/rfc3263 RFC3263] next hop resolution lookup
• Bonjour multicast DNS [http://tools.ietf.org/html/draft-lee-sip-dns-sd-uri-03] (work in progress)

=== NAT Traversal ===

• SIP Signaling: Symmetric Response Routing Symmetric media [http://tools.ietf.org/html/rfc3581 RFC3581]
• RTP media (Audio and Video): Interactive Connectivity Establishment (ICE) [http://www.ietf.org/internet-drafts/draft-ietf-mmusic-ice-19.txt draft-ietf-mmusic-ice-19]
• MSRP media (Instant Messaging and File Transfer): MSRP protocol relay extension [http://tools.ietf.org/html/rfc4976 RFC4976]

=== Voice over IP ===

• RTP, A Transport Protocol for Real-Time Applications [http://tools.ietf.org/html/rfc3550 RFC3550]
• Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP) [http://tools.ietf.org/html/rfc3605 RFC3605]
• The Secure Real-time Transport Protocol (SRTP) [http://tools.ietf.org/html/rfc3711 RFC3711]
• Generation and parsing of RFC 2833/telephone-events payload in both RTP and SDP [http://tools.ietf.org/html/rfc2833 RFC2833]

=== Instant Messaging ===

• Common Presence and Instant Messaging (CPIM): [http://tools.ietf.org/html/rfc3862 RFC 3862]
• Session Initiation Protocol (SIP) Extension for Instant Messaging [http://tools.ietf.org/html/rfc3428 RFC3428]
• MSRP Protocol [http://tools.ietf.org/html/rfc4975 RFC4975]
• Indication of Message Composition for Instant Messaging [http://tools.ietf.org/html/rfc3994 RFC3994]
• Message Summary Event Package [http://tools.ietf.org/html/rfc3842 RFC3842]
• File Transfer [http://tools.ietf.org/html/rfc5547 RFC5547]

=== Desktop Sharing ===

• Variation of [http://tools.ietf.org/html/draft-garcia-mmusic-sdp-collaboration-00 draft-garcia-mmusic-sdp-collaboration-00] using RFB over MSRP

=== Conferencing ===

• Conference Event Package [http://tools.ietf.org/html/rfc4575 RFC4575]
• A Framework for Conferencing with the Session Initiation Protocol [http://tools.ietf.org/html/rfc4353 RFC4353] (work in progress)
• SIP Call Control - Conferencing for User Agents [http://tools.ietf.org/html/rfc4579 RFC4579] (work in progress)
• MSRP ad-hoc multi-party chat sessions [http://tools.ietf.org/html/draft-ietf-simple-chat-05 draft-ietf-simple-chat-05] (work in progress)

=== Presence ===

All server-side features have been built-in and tested with [http://opensips.org OpenSIPS] Presence Agent and [http://openxcap.org OpenXCAP] server.

• SIP Specific Event Notification (SUBSCRIBE and NOTIFY methods) [http://tools.ietf.org/html/rfc3265 RFC3265]
• SIP Extension for Event State Publication (PUBLISH method) [http://tools.ietf.org/html/rfc3903 RFC3903]
• Presence Data Model (PIDF) [http://tools.ietf.org/html/rfc3863 RFC3863], [http://tools.ietf.org/html/rfc3379 RFC3379], [http://tools.ietf.org/html/rfc4479 RFC4479]
• Watcher-info Event Package [http://tools.ietf.org/html/rfc3857 RFC3857], [http://tools.ietf.org/html/rfc3858 RFC3858]
• Rich Presence Extensions to PIDF [http://tools.ietf.org/html/rfc4480 RFC4480]
• Contact Information Extension to PIDF [http://tools.ietf.org/html/rfc4482 RFC4482]
• User Agent Capability Extension to PIDF [http://tools.ietf.org/html/rfc5196 RFC5196]
• XCAP Protocol [http://www.tools.ietf.org/html/rfc4825 RFC4825]
• Common Policy [http://www.tools.ietf.org/html/rfc4745 RFC4745]
• Presence Rules [http://www.tools.ietf.org/html/rfc5025 RFC5025]
• Resource Lists [http://www.tools.ietf.org/html/rfc4826 RFC4826]
• RLS Services [http://www.tools.ietf.org/html/rfc4826 RFC4826]
• PIDF manipulation [http://www.tools.ietf.org/html/rfc4827 RFC4827]
• XCAP Diff [http://www.ietf.org/internet-drafts/draft-ietf-simple-xcap-diff-09.txt draft-ietf-simple-xcap-diff-09]
• OMA specification ''org.openmobilealliance.xcap-directory''
• OMA specification ''oma_status.icon''