Section 18.2.2 Sending Responses (For servers) of rfc3261 says:
if the top Via has a "received" parameter, the response MUST be sent to the
address in the "received" parameter, using the port indicated in the "sent-by"
value, or using port 5060 if none is specified explicitly. If this fails, for
example, elicits an ICMP "port unreachable" response
Now assume a Client (which is behind a proxy and there may be a NAT between the
client and proxy) which is in a 2-way call receives BYE for this call (I am
assuming UAS behaviour by the Client) having top Via header with received
parameter (having ip address which is not same as that of the proxy).
My query:
1. Then should this Client send 200 OK of BYE to this ip address (received)?
2. Will this scenario ever happen for the client (also assume a NAT between the
Client and proxy for the purpose of analysis) in realtime?
3. If this scenario will never happen in real time then does the RFC
statement(written above) stands valid for this Client (UAS in this case)?
Please correct my understanding if it is wrong somewhere.
Thanks in advance
Anand Kumar
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