sip:Anonymous@Anonymous.invalid - Local Policy from/to

@1

Hello,

 

We have a realm (access_internet_sip) which is used by several session-agents (as source-realm).

 

We recieve calls with From headers such as:

"sip:Anonymous@Anonymous.invalid;tag=gK050e54a8".

 

My question is how these calls should be routed through the SBC without "from-address = *" in local-policy.

 

I've seen statements such as "Do not ever touch From/To headers" so I am vary of just setting "sip:Anonymous@1.1.1.1" by HMR.

 

local-policy
        from-address                           1.1.1.1
        to-address                               *
        source-realm                            access_internet_sip

 

This doesn't match "sip:Anonymous@Anonymous.invalid" calls as they are not from @1.1.1.1.

 

How do you recommend to match these calls?