sip服务器原代码,要求在linux或者unix下安装,可以用于建立自己的voip系统,基于sip协议-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 scr ipting language for routing logic

variables support in scr ipt- scr ipt 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