Please document common providers like jmp.chat

This comes up so often so there has to be a Documentation gap. I grabbed this form a matrix channel

$ cat .config/calls/sip-account.cfg 
[sip-00]
Host=jmp.bwapp.bwsip.io
User=username~40domain.net
DisplayName=jmp-chat
Protocol=UDP
Port=0
AutoConnect=true
DirectMode=false
LocalPort=0

and things have even GUI now so it would be great to have it documented for mortals. Related #385

@devrtz I know you're on it. I'm just filing it so we have a link target.