Cleo Integration Cloud - Secure Integration and Data Movement Platform
Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
Software AG webMethods - Software AG’s webMethods enables you to quickly integrate systems, partners, data, devices and SaaS applications
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
MuleSoft Anypoint Platform - Anypoint Platform is a unified, highly productive, hybrid integration platform that creates an application network of apps, data and devices with API-led connectivity.
tSIP - tomeko.net/software: SIP client for Windows.