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Introduction
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This documentation is intended for developers looking to develop Session Initiation Protocol (SIP) based client application. Some knowledge on SIP is definitely required, and of course some programming experience. Prior knowledge of PJSUA C API is not needed, although it will probably help.

PJSIP libraries provide multi-level APIs to do SIP calls, presence, and instant messaging, as well as handling media and NAT traversal. Knowledge of SIP protocol details (such as the grammar, transaction, dialog, and whatnot) are not required (but it will help a lot!), however you should know how SIP works in general and particularly how to configure SIP clients to, e.g. register to a SIP provider, specify SIP URI to make call to, and so on, to use the module.

Getting Started with PJSIP
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Check `PJSIP's Features List`_ to make sure that it has the features that you require.

.. _`PJSIP's Features List`: http://trac.pjsip.org/repos/wiki/PJSIP-Datasheet

To start using PJSIP, the `Getting Started Guide`_ contains instructions to acquire and build PJSIP on various platforms that we support.

.. _`Getting Started Guide`: http://trac.pjsip.org/repos/wiki/Getting-Started 

PJSIP Info and Documentation
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To get other relevant info and documentations about PJSIP, you can visit:

- `PJSIP General Wiki`_
- `PJSIP FAQ`_
- `PJSIP Reference Manual`_ - please see Reference Manual section

.. _`PJSIP General Wiki`: http://trac.pjsip.org/repos/wiki
.. _`PJSIP FAQ`: http://trac.pjsip.org/repos/wiki/FAQ
.. _`PJSIP Reference Manual`: http://trac.pjsip.org/repos/wiki



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