matching the source ip and port

[pm8pm8 at t-online.de]

Dear All,
 
When receiving a response to a DNS query, does Unbound match the source ip 
of the response to the destination ip of the query and discard the response 
if they do not match? Does it match the ports?
I.e. apart from checking
query.transactionID == response.transactionID
does Unbound check for
query.destinationIP == response.sourceIP
and
query.destinationPort == response.sourcePort?
Can you point me to the function in the source code where this check does 
or does not happen?
Any help is appreciated.


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