How to enable distinct behaviour between internal and external calls?
Make a dedicated ring group for every extension and use that in inbound routes and/or IVR configurations.
FreePBX Yealink configuration
Misc destinations and how to preserve CID and fix sound
When FreePBX reroutes an incoming call to an external destination, that destination doesn’t see the number of the calling party and might not hear it.
How to enable distinct ringtones between internal and external calls?
Change a setting in your inbound route and Yealink phones.