Kamailio (OpenSIPS) is a mature telecommunication level SIP Server platform, can be widely used in the SIP application routing distribution, load balancing, can be used to build the SIP proxy, SIP registration services, etc., and the current OpenSIPS itself provide SIP Presence and IM also function, at the same time, it should be noted that the OpenSIPS itself does not provide media related services, such as call centers, VoiceMail and other business, the business can be FreeSwtich, sipXecs platform implementations such as
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