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+$Id$
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+
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+iptel.org SIP Express Router (SER) is a high-performance,
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+configurable, free server implementing Session Initiation
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+Protocol (SIP, RFC3216). SIP is a signaling protocol that
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+allows Internet users to establish VoIP calls, advertise
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+their presence status, send and receive instant messages,
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+and maintain any kind of session including games and chats.
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+A major benefit of SIP is it creates an open framework for
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+composing services out of multiple components.
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+
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+SER features flexibility that allows it to act in many roles
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+needed for implementation of such services. For example, it
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+can act as registrar and location server to provide mobility
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+to users. It can also act as an access control element that
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+guards PSTN gateways or any other scare SIP resources. Its
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+built-in configuration language along with use of "plug-in"
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+modules allows to add more new functionality easily. Currently
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+available plug-ins implement messaging gateways to SMS and
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+Jabber, RADIUS accounting and authorization, message store,
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+SIMPLE presence agent and ENUM.
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+
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+There is also an application interface, that provides effective
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+coupling with SIP-unaware applications. The applications, like web
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+interface or administrative tools, can easily watch and manipulate
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+server status, initiate SIP transactions and build features
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+such as "click-to-dial". The application-interface is language-
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+independent and can be used along with a variety of effective
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+programming languages.
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+
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+SER has been designed to be able to scale and deal with various
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+stress conditions. These may include communication with broken
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+network components, signaling over NATs, power-up reboot avalanches,
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+large user population, and any SIP applications generating high
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+volume of traffic. Currently, transactional throughput of the
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+server reaches thousands of calls per second on an off the
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+shelf PC.
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+
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+--
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+
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+Technical information: ANSI C-Written. Ported to Linux, BSD and Solaris (Sun).
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+Support for both IPv4 and IPv6. Small footprint size: 300k core, all common
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+plug-ins (optional) up to 630k. Web-based user provisioning, serweb, available.
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+
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+More information: SER distribution and documentation is available from
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+iptel.org's site at http://www.iptel.org/ser/. User forum is available
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+at http://mail.iptel.org/mailman/listinfo/serusers/.
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Jiri Kuthan