This partially reverts commit 231915bf4ce5c580a4a3afe5ee3cd0cf90db0f83.

Parts revered:

* Refactor TLS registration handling in kamailio.cfg
  - Updated logging for TLS registration checks to use L_INFO level.
  - Simplified the logic for determining if a phone number requires TLS.
  - Added SRV query checks for TLS domain resolution.