Features and Standards
SIP SIMPLE client SDK is a Software Development Kit for development of Real Time Applications based on SIP and related protocols for Audio/Video, 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 for Linux, Mac OSX and Microsoft Windows operating systems. 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/PJMEDIA 2.10 with patches required for the SDK advanced functionality.
To see SIP SIMPLE client SDK features in action you can try Blink or SylkServer
Features
General
- Multiple SIP accounts support
- Full DNS support (NAPTR, SRV, A record lookup for all protocols)
- Non-blocking, asynchronous, notifications based engine
- Configuration framework
- Multiple media types per session (e.g. Audio, Video, IM)
- Trace capability for all underlying protocols
- Supports re-INVITE for adding and removing media
Security and Privacy
- TLS for SIP signaling and media (MSRP, XCAP)
- SRTP for RTP media (audio and video)
- SDES and ZRTP key exchange for SRTP
- OTR for MSRP streams and SIP MESSAGE
Supported Media *
- Audio and Video (RTP)
- Instant Messaging (MSRP)
- File Transfer (MSRP)
- Screen 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 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).
Audio features
Conference Mixer
Wav Player and Recorder
Acoustic Echo Cancelation
Noise Suppression
Answering Machine
Codecs
Ultra-wideband: OPUS 48kHz, Speex 32kHz
Wide-band: Speex and G722, AMR
Narrow-band: G711, iLBC, GSM, AMR
Video features
Codecs
H.263, H.264
VP8, VP9
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
The Session Initiation Protocol (SIP) Refer Method RFC3515
The Session Initiation Protocol (SIP) "Replaces" Header RFC 3891
Session Initiation Protocol (SIP) Call Control - Transfer RFC 5589
Obtaining and Using Globally Routable User Agent URIs (GRUUs) RFC 5627
Address Resolution
Locating SIP services: RFC3263
Bonjour multicast DNS: https://tools.ietf.org/html/draft-lee-sip-dns-sd-uri-03
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
MSRP Alternative Connection Model (ACM) RFC6135
Audio and Video
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
ZRTP Encryption RFC6189
Instant Messaging
Common Presence and Instant Messaging (CPIM): RFC 3862
Session Initiation Protocol (SIP) Extension for Instant Messaging RFC3428
Indication of Message Composition for Instant Messaging RFC3994
Message Summary Event Package RFC3842
Instant Message Disposition Notification (IMDN) RFC5438
Off-the-Record Messaging Protocol OTRv3
File Transfers
MSRP Protocol RFC4975
SDP Offer/Answer for File Transfers RFC5547
Support for OMA http filetransfer RCS RCC.07
Support for end-to-end OpenPGP encryption
Screen 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
SIP Call Control - Conferencing for User Agents RFC4579
MSRP ad-hoc multi-party chat sessions draft-ietf-simple-chat
Presence
SIP Specific Event Notification (SUBSCRIBE and NOTIFY methods) RFC3265
SIP Extension for Event State Publication (PUBLISH method) RFC3903
SIP Event Notification Extension for Resource Lists Contact Information Extension to PIDF RFC4482
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
RLMI document handling RFC4662
PIDF manipulation RFC4827
XCAP Diff RFC5874
OMA Reference Release Definition for XDM v1.1 and Presence SIMPLE v1.1 Implementation Guidelines
OMA XML Document Management V1.1