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.
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