Wire provides End to end encryption for chat,voice and video calls High audio quality. Wire is all about security. Highly flexible and integral communication solution. Good UI - easy to use. Screen and chat sharing Multiple device support scheduled messaging feature available image annotation and sketching available data sync on all devices multi platform authentication options

Communicate with teams through private or group conversations – Share and collaborate with files, documents, links with reactions – Press the one-click conference call button and your voice or video meetings starts on time – Invite partners, customers and suppliers to collaborate through the unique guest rooms – Increase privacy through ephemeral messages and device fingerprinting – Integrate Wire with your corporate applications and services

I find Wire to offer conference calls of high quality - no lags or interruptions. Pricing is great if you're willing to compromise the confusing UI/UX, and you can try it free for 30 days (no credit card required).. It's good that you can back up conversations. You can create additional services like chatbox but that requires coding skills.