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akram.root
Enthusiast

Block unwanted calls on cisco Expressway

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 

 

 

 

1 REPLY 1
Nithin Eluvathingal
VIP Advisor

This is Commonly seen,  If your configured search rules allow such request they can use it for tall fraud.  

 

Use call Policy on expressway.

You can set up rules to control which calls are allowed, which calls are rejected, and which calls are to be redirected to a different destination. These rules are known as Call Policy (or Administrator Policy).

If Call Policy is enabled and has been configured, each time a call is made the Expressway will execute the policy in order to decide, based on the source and destination of the call, whether to:

  • proxy the call to its original destination

  • redirect the call to a different destination or set of destinations

  • reject the call

 

Go through the below Guide and link and configure as you require. 

https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/admin_guide/Cisco-Expressway-Administrator-Guide-X12-5-1.pdf

https://melvinleejr.blogspot.com/2018/02/securing-expressway-b2b.html

 

 



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