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SRP541W Router how to restrict a single IP in-bound, on port 5060. blocking everything else

HI. I have a SRP541W Router. we are getting alot of SIP attackes on port 5060.

We have port 5060 forwarded to our PBX internaly.

I would like to configure the firewall so that only specific IP addresses are alowed through everything else is blocked.

Thanks in advanced

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