SIP SIMPLE Client SDK

= Developer Guide =

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

The goal of SIP SIMPLE client SDK is to provide a simple to use API to create Real Time Communications Applications for Internet end-points based on SIP and related protocols.

By using this API you can add Audio, Instant Messaging, File Transfer capabilities to and existing product or create a new product from scratch.

== Prerequisites ==

To use SIP SIMPLE client SDK 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 in general and real time application development in particular are strongly recommended.

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

== Middleware ==

To develop your SIP Application you should use the event-driven non-blocking Middleware API that 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 SIP Application for setting up Audio, Instant Messaging, File Transfer and Desktop Sharing sessions.

 * [wiki:SipMiddlewareApi Middleware API] - middleware for developing of SIP Client Applications

 * [wiki:SipConfigurationAPI Configuration API] - used for managing the settings used by the Middleware

The middleware is used by the [wiki:SipTesting Command Line Tools], they provide detailed practical examples for how to use all functions available in the SDK. 

=== Sample Code ===

 * ''Command Line Tools'' are the best example for how to use the SIP SIMPLE client SDK.

 * [http://icanblink.com Blink], a fully featured and easy to use SIP client.

=== Components ===

If you wish to develop your own middleware or applications while having full control over the underlying protocol layers yourself, you can use the following APIs that provide granular control over their respective components:

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

 * [wiki:SipCoreApiDocumentation SIP Core API] - The API for the SIP, RTP, ICE and Audio Engine including cross platform audio-device abstraction, codecs and jitter buffer

 * [wiki:SipMSRPApi MSRP API]  - The API for Message Session Relay Protocol (MSRP) and its Relay Extension

 * [wiki:SipXCAPApi XCAP API]  - The API for presence policy documents on XCAP servers

You may use for example the above components API to create SIP Server Applications, something the high level middleware was not designed for.

== Network ==

To use a SIP Application you need access to the Internet. The following ports are being used:

|| '''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.udp_port ||

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

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