PJSIP. Extenions works, but "no matching endpoint" regularly repeating in log

I have extensions registered as PJSIP, working fine, but i’m getting the exact message below
My phones send a ping every 60 seconds which causes the log entry below. I suspect the “sip:domain.net” portion is maybe what is causing this? should it look like that or something else?

res_pjsip/pjsip_distributor.c:347 log_unidentified_request: Request from ‘“sip:domain.net”’ failed for ‘’ (callid: 588d830e84969911) - No matching endpoint found

I’m getting this also…