
Elastix
freepbx
FreeSWITCH
Wazo
Asterisk
3CX
FusionPBX
Kamailio
SIPNEX
Invoca
CallRail
SIPNEX Call Tracking is a carrier-grade call attribution solution that provides tracking phone numbers, real-time call detail records, and call recording to measure marketing campaign performance without traditional call tracking platform fees.
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freepbx - FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).
Invoca - Call tracking & analytics software
FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.
CallRail - A-la-carte call tracking software for small business
Wazo - Wazo is a unified communications platform based on Asterisk and focused on extensibility.
Asterisk - An open source telephony switching and private branch exchange service for Linux.