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Blocking calls sip

Hi guys, we are getting spam calls from outside with caller id from our pool. So phone numbers were spoofed ... What steps can be done to prevent /block this callers? 

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Dennis Mink
VIP Alumni
VIP Alumni

Is this thru VCSe or CUCM SIP trunk to provider?

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its coming via ITSP sip trunk via cube. SOmetimes it shows desk phone number called to the same desk phone number, some calls shows on sip user A cell phone dialed to user A desk phone . we can't block their cell phone numbers  obviously :) but should be some way to prevent this , right ?

ok, looks like we found a way, so on the cube we has programmed his did in blocked list , so user will not get any calls again from his own did. we will probably need to created more of this blocking rules ... 

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