SIP Proxy Server Open Source System for VoIP

What is SIP Server?

The SIP Server is a stable Open Source implementation of a SIP server. The company named OpenSIPS has developed a SIP proxy/router. As per opensips not just sip proxy, as it includes application-level functionalities. The main core element of any SIP-based Voip system is a SIP server. With this routing engine, OpenSIPS unifies Voice, Video, IM in a better way.

Why to use OpenSIPS?

• Better performance.
• Ease of use.
• Flexibility.
• Monitoring and control
• Web interface.

Features:

• Open SIP registrar server
• Open SIP router / proxy (lcr, dynamic routing, dialplan features)
• Open SIP redirect server
• Open SIP presence agent
• Open SIP back-to-back User Agent
• Open SIP IM server (chat and end-2-end IM)
• Open SIP to SMS gateway (bidirectional)
• Open SIP to XMPP gateway for presence and IM (bidirectional)
• Open SIP load-balancer or dispatcher
• Open SIP front end for gateways/asterisk
• Open SIP NAT traversal unit
• Open SIP application server

Download Links/Resources:

• Opensips Download link 
• External Download Links

Related Project on Google code hosting