Need different Ringtone for external(Ringgroup) and internal calls for 3CX free on Yealink W73H/W70Base

[MiniSteps]

Hello
Using the 3CX Free Hosted V20. User has 6 Cordless Yealink W73H on W70 Base. External call comes in via Ring Group.
Would like a different ringtone for External calls and internal calls.
Is this possible.
Thanks
Jamil