e12e9092 SIP Express Router (ser)
 1. Introduction
    SIP Express Router (SER) is an industrial-strength, free VoIP server
    based on the session initiation protocol (SIP RFC2543-bis).  It is
    engineered to power IP telephony infrastructures up to large scale. The
    server keeps track of users, sets up VoIP sessions, relays instant
    messages and creates space for new plug-in applications. Its proven
    interoperability guarantees seamless integration with components from
    other vendors, eliminating the risk of a single-vendor trap. It has
    successfully participated in various interoperability tests in which it
    worked with the products of other leading SIP vendors.
    The SIP Express Router enables a flexible plug-in model for new
    applications: Third parties can easily link their plug-ins with the
    server code and provide thereby advanced and customized services.  
    Its performance and robustness allows it to serve millions of users and
    accommodate needs of very large operators. With a $3000 dual-CPU, the SIP
    Express Router is able to power IP telephony services in an area as large
    as the Bay Area during peak hours. Even on an IPAQ PDA, the server
    withstands 150 calls per second (CPS)! The server has been powering our free SIP site withstanding heavy daily load that is further
    increasing with the popularity of Microsoft's Messenger.  
    The SIP Express Router is extremely configurable to allow the creation of
    various routing and admission policies as well as setting up new and
    customized services. Its configurability allows it to serve many roles:
    network security barrier, application server, or PSTN gateway guard for
 2. Feature List
    See for an updated feature list.
    Note that as features easily are added as modules, changes can
    occur quickly.
    Most of SER features are implemented as plug-in modules. See for a list of modules 
    available in SER distribution.
 3. About
    See for the story of SER and
 4. Obtaining Help
    We offer best-effort free support for ser. "best-effort" means 
    that we try to solve your problems via email as soon as we can, 
    subject to available manpower. 
    To receive feedback to your inquiries, we recommend you to subscribe to
    the serusers mailing list and post your queries there. This mailing list
    is set up for mutual help by the community of ser users and developers.
    To participate in the mailing list, subscribe at the following web
    Send your questions to 
 5. More Information
    Most up-to-date information is always available at our website,
    Particularly, it includes:
       o  administrator's guide
       o  installation guidelines (INSTALL)
       o  download links
       o  list of known issues (ISSUES)
       o  etc.