VOiS by Bank Islam

VOiS is Bank Islam’s unified secure communication and collaboration platform and brings the privacy of the end user to the next level. The iOS app for VOiS complements the single end-user experience for VOiS UCC users and provides an unmatched Verified E2EE secured, decentralized communication infrastructure. The application supports voice and video calls and chat in a single collaboration platform. All data between the mobile app and the desktop client/app is synchronized.

It also provides a direct access to the traditional voice functionality to call to the public network and to receive calls from any extension.
You need to have an account from Bank Islam to log onto the system.