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 SIP call flows from [http://www.tech-invite.com/Ti-sip-CF3665.html RFC 3665]. Understanding of TCP/IP networking in general and real time application development in particular 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 is event-driven, non-blocking and hides the complexity and the interactions of the lower level SIP, SDP, RTP, ICE, MSRP, XCAP and related protocols. 

With a minimal amount of coding you can create a rich client application for setting up audio, instant messaging, file transfer and desktop sharing sessions.

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

 * [wiki:SipSettingsAPI Configuration API] - used for 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 ==

If you wish to develop your own middleware and/or application while having control over 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, something the high level middleware was not designed for.

== TCP/IP ports ==

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''' ||

|| 1xport >1024 || In/Out || Typically 5060 set in DNS|| UDP || [wiki:SipCoreApiDocumentation#Engine SIP over UDP] || At start || Global.sip.local_udp_port ||

|| 1xport >1024 || In/Out || Typically 5060 set in DNS ||TCP || [wiki:SipCoreApiDocumentation#Engine SIP over TCP] || At start ||Global.sip.local_tcp_port ||

|| 1xport >1024 || In/Out || Typically 5061  set in DNS ||TCP|| [wiki:SipCoreApiDocumentation#Engine SIP over TLS] || At start || Global.sip.local_tls_port ||

|| 2xport >1024 || In/Out || Random negotiated in SDP || UDP || [wiki:SipCoreApiDocumentation#RTPTransport RTP/RTCP stream] || Per session || Global.rtp.port_range ||

|| 1xport >1024 || In/Out || Typically 2855 negotiated in SDP || TCP || [wiki:SipMSRPApi#transport.MSRPTransport MSRP stream] || Per session || Global.msrp.local_port ||

|| 1xport >1024 || Out || Typically 443, configured || TCP || [wiki:SipXCAPApi XCAP requests] || Per request|| ||