ABTO SIP Server supports making calls over Internet and defines the way of handling of interactive voice, video and IM sessions.

Main features:
* implementation of the relevant standards from the SIP working groups;
* support for multiple transport protocols (both IPv4 and IPv6);
* security mechanisms (with the newest SIP Security IETF efforts);
* simple user management through an embedded configuration web server;
* use of readily available databases.

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