Author here: The first priority of the project is to offer a solid generic audio-only calling experience to our users. This includes all functionality that people would expect from a softphone. At the same time, we want to build something that is generic and useful to any SIP-over-wss provider in the short term. The build mechanism and module-system should accomodate this. It is still under construction (https://github.com/vialer/vialer-js/tree/feature/restructure...), but most of the hardcoded dependencies are already dealt with.

Besides the current SIP Call implementation, we are preparing the codebase for additional signalling implementations as well. The centralized SIP Call implementation is great to use with all the functionalities a PBX offers (queues, on-hold, transfers, being available to any device), but browser-to-browser p2p also has its strong points. Privacy-aware chat, video and file transfer seem easier to implement and maintain with nothing more than JavaScript and another browser as a backend. The signalling part will be a bit of a design challenge. Ideally, this would be p2p and encrypted too, so people don't need to rely on one server/provider to find their contacts and setup connections with.