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Based on the handled SIP functions criteria the softswitch combines the roles of three different elements:

  • Back to Back User Agent – the core set of functions responsible for traffic control.
  • Registrar server – location server supporting SIP registration functionality.
  • Presence server – a network service which accepts, stores and distributes presence information.

These roles can be implemented on a single application instance or in multi-server deployment with dedicated instances serving a specific role. You can enable the roles per instance through its configuration file.

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