Ringing via earphone

[montecito79]

How can I set ringtone via earphones while earphones are connected to the device?
I tried everything but it always ringing the device not via earphones.

 

[Just_Me_D]

I haven't used a "wired" headphone with my iPhone in quite sometime, and I don't recall hearing call notifications go solely to them. Other notifications did, if I remember correctly.

 

[Lee_Bo]

I just tested with my airpods. Called my cell phone from my desk phone and my iPhone and Apple Watch both vibrated and I heard the ringtone and "unknown caller" via airpods.