PJSUA API - High Level Softphone API wraps together all SIP components and media into a high level API, suitable for creating typical SIP user agent applications.

PJSIP - Open Source SIP Stack features easy to use API for:

*multiple client registration (accounts).
*high level SIP and media session (calls).
*buddy list, presence and instant messaging,
*powerful and very easy to use media manipulation.

while maintaining some space for customization (custom SIP transport, custom SIP media, etc.) needed by some types of applications. PJSUA API - High Level Softphone API is also aimed to be able to run on devices such as PDA or mobile phones, by carefully allowing application to set the appropriate threading strategy and memory limits (number of calls, media ports, etc.).

However, PJSUA API - High Level Softphone API may not be the most suitable API for some types of applications, since it is directed towards an easy to use API. For more more advanced use, you may better implement the application by using PJSIP + PJMEDIA directly, as described below.

PJSIP - Open Source SIP Stack is designed for:
Linux,WinXP,WinVista,Win2000,

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