Allow Desktop & Mobile Ring Grouping for Call Handling & Forwarding

Right now, desktop & mobile can not be added to ring groups so it is only beneficial if you want to let it ring on desktop/mobile first for sequential or if you are using a simultaneous setup. If it can be part of a custom group you can have it ring on desktop/mobile and say your yealink phone simultaneously before it forwards to another sequential option (ie. an answering service).