sergey-safarov left a comment (kamailio/kamailio#4290)

In the sanity module documentation, I can see

content length - (128) - checks if the size of the body matches the value from the Content-Length header.

Technically, the SIP message body is equal Content-Length header value. Here is the present trailer, which is not specified in the sanity module description.

When SDP is smaller or bigger than it is specified in the Content-Length header sanity check will properly drop the message because in this case it breaks the RFC. But in this case SIP message is RFC compliant.

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