https://www.portaone.com/Product/portaswitch
広告Integrated Softswitch and Billing Platform of VoIP and Unified Communications for Telcos. Enable and Monetize Hosted IP PBX, SIP Trunking, UCaaS, OTT VoIP Calls, WebRTC, VoLTE
24/7 Support · OTT VoIP calls · Transparent pricing · Unlimited License