<div>Hi</div>
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<div>I am setting up a Calling card Plat form</div>
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<div>I have incoming toll number, the provider charges incoming calls</div>
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<div>I see some spammers( competetors) keep calling my toll. so iam getting huge invoices</div>
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<div>how can i identify those kind of spammers and block the callerID for some time</div>
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<div>any suggestions or example could help me</div>
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<div>ram</div>