Impact of HMR Rejections on SBC Source IP Blacklisting

I am considering bypassing ECB registration and instead authenticating the source by verifying a specific string within a SIP header.

However, I have a question I'd like to clarify. We know that if registration fails repeatedly, the SBC will put the source IP on a blacklist for a cooldown period before it resumes processing requests from that source.

If I switch to using HMR for header validation and consistently reject requests due to invalid headers, will the SBC still blacklist that source? Or will it just keep processing and evaluating every incoming request initiated by that source?