Thank you for your response. 

Actually, we are using sanity module. We call sanity_check() in our CFG which 
makes the other types of malformed messages correctly return 400. 

However, it seems that after upgrading versions, this specific case (malformed 
From header) is not even reaching the CFG logic layer. I don't know if there is 
some sort of built in flag (like a STRICT_SIP_PARSINNG)  that can allow us to 
return to the previous behavior? 

Here are some examples of the malformed from headers we are testing: 

- from_hdr = "\"Mr.J.User <sip:[email protected]>"
- from_hdr = "\"Mr.J.User\" <sip:j@[email protected]>"

Again, thank you in advanced for your time. 

Matteo Cazzola.
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