Genesys - Genesys provides omnichannel customer experience and contact center solutions in the cloud and on-premises.
Aspect Prophecy - Aspect Prophecy is a powerful, entirely standards-based platform for speech, IVR, and SIP VoIP...
Avaya Voice Portal - Voice Portal delivers on industry leading IT fit, reliability, scalability and manageability.
Twilio - Brings voice and messaging to your web and mobile applications.
Asterisk - An open source telephony switching and private branch exchange service for Linux.
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.