!!!!!About -> Features

!!About -> Features
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Some of the features that '''OpenSIPS''' brings:

* robust and performant SIP (RFC3261) Registrar server, Location server, Proxy server and Redirect server
* small footprint - the binary file is small size, functionality can be stripped/added via modules
* plug&play module interface - ability to add new extensions, without touching the core, therefore assuring a great stability of core components
* stateless and transactional statefull SIP Proxy processing
* support for UDP/TCP/TLS/SCTP transport layers
* IPv4 and IPv6
* support for SRV and NAPTR DNS
* SRV DNS failover
* IP Blacklists
* multi-homed (mhomed) and multi-domain support
* flexible and powerful scripting language for routing logic
* variables support in script - script variables, pseudo-variables (access to the SIP messages), AVPs (values persistent per SIP transactions)
* management interface via FIFO file and unix sockets
* authentication, authorization and accounting (AAA) via database (MySQL, Postgress, text files), RADIUS and DIAMETER
* digest and IP authentication
* Presence Agent support (many additional integration features)
* XCAP support for Presence Agent
* CPL - Call Processing Language (RFC3880)
* SNMP - interface to Simple Network Management Protocol
* management interface (for external integration) via FIFO file, XMLRPC or Datagram (UDP or unixsockets)
* NAT traversal support for SIP and RTP traffic
* ENUM support
* PERL Programming Interface - embed your extensions written in Perl
* Java SIP Servlet Application Interface - write Java SIP Servlets to extent your VoIP services and integrate with web services
* load balancing with failover
* least cost routing
* support for replication - REGISTER offer new functions for replicating client information (real source and received socket).
* logging capabilities - can log custom messages including any header or pseudo-variable and parts of SIP message structure.
* modular architecture - plug-and-play module interface to extend the server's functionality
* gateway to sms (AT based)
* multiple database backends - MySQL, PostgreSQL, Oracle, Berkeley, flat files and other database types which have unixodbc drivers
* straightforward interconnection with PSTN gateways
* dialog support (call monitoring, call termination from proxy side, call profiling)
* XMPP gateway-ing ( transparent server-to-server translation)
* impressive extension repository - over 70 modules are included in OpenSIPS repository

Scalability:

* OpenSIPS can run on embedded systems, with limited resources - the performances can be up to hundreds of call setups per second
* used a load balancer in stateless mode, OpenSIPS can handle over 5000 call setups per second
* on systems with 4GB memory, OpenSIPS can serve a population over 300 000 online subscribers
* system can easily scale by adding more OpenSIPS servers
* OpenSIPS can be used in geographic distributed VoIP platforms
* straightforward failover and redundancy