The SIP Register Filtering feature allows monitoring of SIP registration messages and manipulation of the SIP registration flow. It could be used to protect the system against fraudulent SIP registration requests (i.e. as a scanner protection mechanism).
SIP Register Filtering configuration contains a list of rules to verify when receiving a SIP registration message. Each rule contains a list of conditions and a list of actions. Each SIP registration messages are verified against the SIP Register Filtering rule conditions. When a SIP registration message matches the conditions of a SIP Register Filtering rule, the actions of the rule get executed. Please check following link for more details; https://docs.telcobridges.com/tbwiki/SIP_Register_Filtering