Top 10 Cisco Jabber Alternatives

Kamailio is an Open Source SIP Server released under GPL, able to handle thousands of call setups per second. Kamailio can be used to build large platforms for VoIP and realtime communications Ð presence, WebRTC, Instant messaging and other applications. It can also easily be applied to scaling up SIP-to-PSTN gateways, PBX systems or media servers like Asterisk, FreeSWITCH or SEMS.

Open source PBX system providing a complete telecommunications platform.

The Mitel Applications Suite consolidates a comprehensive set of unified business communications and collaboration applications onto a single server footprint with common installation, commissioning, and administration tools. MAS delivers capabilities such as unified messaging, speech-enabled auto-attendant, mobility, teleworking, sophisticated audio, video, and web conferencing, informal contact center functionality, and business reporting.