Zoiper

Zoiper is a widely recognized company that offers a range of softphone solutions for VoIP (Voice over Internet Protocol) communication. Their software allows users to make and receive VoIP calls using their preferred SIP (Session Initiation Protocol) provider or PBX (Private Branch Exchange), either through smartphones or computers. Zoiper provides applications for various platforms, including iPhone, Android, and Windows, enabling users to connect through 3G, 4G/LTE, 5G, or WiFi networks. With Zoiper, users can enjoy voice and video calls, instant messaging, and seamless connectivity. Their softphone solutions cater to service providers, call centers, integrators, mobile operators, and businesses utilizing VoIP technology for effective communication.

https://www.zoiper.com/