Hello all,
I have a many call sip attack my cucm , and many unknown user from extern can calls my ip phones registered on my cucm .
After cheick my Cisco Expressway-C , i find a this source : 100@mydomain.com
calls many numbers to destination : *@mydomain.com .
is this a attack ? and how can i prevent it ?
Could you help me please ?
Best regards
Akram