SIP SIMPLE Client SDK

= Developer guide =

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

The main goal of this library is to provide a simple to use API to create real-time communications applications between end-points based on SIP protocol. 

== Prerequisites ==

To use the library and the concepts described below you must be familiar with Python programming language and basic SIP call flows from [http://www.tech-invite.com/Ti-sip-CF3665.html RFC 3665]. Understanding of TCP/IP networking and real time application development in general are strongly recommended.

Instructions for installing the library are found [wiki:SipInstallation here].

== Middleware ==

To develop your application you should use the middleware API that hides the complexity and interactions of the lower level SIP, SDP, RTP, ICE, MSRP, XCAP and related protocols. With a minimal amount of coding you can create a client SIP application for setting up audio, instant messaging and desktop sharing sessions.

 * [wiki:SipMiddlewareApi Middleware API] - event driven middleware suitable for developing interactive user interfaces (e.g. GUI)

 * [wiki:SipSettingsAPI Settings API] - used to managing the settings used by the middleware

=== Sample code ===

The middleware API is used by the command line tools used for [wiki:SipTesting testing the library].

== Components ==

To develop your own middleware or application while controlling the underlying protocol layers yourself, you can use the following APIs that provides granular control over their respective components:

 * [wiki:SipCoreApiDocumentation SIP core API] - The API for the SIP, SDP, RTP, ICE and audio engine (cross platform sound-card abstraction, codecs)

 * [wiki:SipMSRPApi MSRP API]  - The API for Message Session Relay Protocol (MSRP) and its relay extension used for instant messaging, file transfers and desktop sharing applications

 * [wiki:SipPresenceApi Presence API]  - The API for payloads carried within SIP signaling used for publication, subscription and notifications of SIP events

 * [wiki:SipXCAPApi XCAP API]  - The API for XCAP document manipulation used for storage of buddy lists and presence policy documents

You may use for example the above components API to create a SIP application server.

== Networking ==

To use a SIP application you need access to a TCP/IP network (e.g. the Internet). The library uses the following ports when active:

|| '''Local port''' || '''Direction''' || '''Remote port''' || '''Protocol''' || '''Description''' || '''Allocation''' || '''Setting''' ||

|| 1x Random>1024 || In/Out || Typically 5060 set in DNS|| UDP || SIP over UDP || At start || Global.sip.local_udp_port ||

|| 1x Random>1024 || In/Out || Typically 5060 set in DNS ||TCP || SIP over TCP || At start ||Global.sip.local_tcp_port ||

|| 1x Random>1024 || In/Out || Typically 5061  set in DNS ||TCP|| SIP over TLS || At start || Global.sip.local_tls_port ||

|| 2x Random>1024 || In/Out || Random negotiated in SDP || UDP || RTP/RTCP media stream || Per session || Global.rtp.port_range ||

|| 1x Random> 1024 || In/Out || Typically 2855 negotiated in SDP || TCP || MSRP stream over TLS || Per session || Global.msrp.local_port ||

|| 1x Random> 1024 || Out || Typically 443, statically provisioned || TCP || XCAP requests || Per request|| Global.xcap.local_port ||