Has anyone done that?  I currently have WebRTC clients connecting to FS from Chrome and/or Firefox but I now need to do it from my mobile apps (Android and iOS).

Any recommendation on how to do it?  I use JsSip in the browsers.  Any way to make a JS library like that to work from an app?  If not, any other suggestions?  

WebRTC vs. SIP?

WebRTC with SIP vs WebRTC with Verto?

I apologize if this topic is not about Freeswitch's own functionality but I thought people would b interested and wanted to pick this group's brain.