Can anyone tell me why I am seeing this empty registration message:

Connected to Asterisk GIT Version adaec47 currently running on repeater (pid = 555)

Verbosity is at least 3

[Jul 24 16:20:55] NOTICE[617]: chan_iax2.c:6809 register_verify: Empty registration from 24.124.97.212

repeater*CLI>


This message repeats every 30 seconds.  24.124.97.212 is my IP address.   Everything seems to be working fairly well.  It is running on a Raspberry Pi 3B+. Hams connect to it with Zoiper, Echolink, and Dvswitch Mobile and use it to make a connection  to the QRM DMR network.  


Ted, KC3OL