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OpenSER
Kamailio formally known as OpenSER - The open source SIP server, which when combined with the advanced functionality of Asterisk gives you get the best of both worlds. Load Balancing, NAT Traversal and Failover are handled seamlessly to provide the ultimate SIP environment.
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Kamailio is a mature and flexible open source SIP server. It can be used on systems with limited resources as well as on carrier grade servers, scaling to up to thousands of call setups per second. It is written in pure C for Unix/Linux-like systems with architecture specific optimizations to offer high performance. It is fully customizable, being able to perform as a fast load balancer, SIP server, location server, proxy server, redirect server, SMS/XMPP gateway or advanced VoIP application server.
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Scalability:
- Kamailio used as a load balancer in stateless mode can handle over 5,000 call setups per second.
- On systems with 4GB memory, Kamailio can serve a population of more than 300,000 online subscribers.
- Scalability is easily achieved by simply adding more Kamailio servers.
- Kamailio can be used in geographically distributed VoIP platforms
- Straightforward failover and redundancy
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