[asterisk-users] how to block spammer calls

[ram]

Hi

I am setting up a Calling card Plat form

I have incoming toll number, the provider charges incoming calls

I see some spammers( competetors) keep calling my toll. so iam getting huge
invoices

how can i  identify those kind of spammers and block the callerID for some
time

any suggestions or example could help me

ram
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