Hi, imagine a request from NAT received by a UAS with publi IP:
# INVITE from 80.80.80.80:5060
Via: SIP/2.0/UDP sip:192.168.0.100:5060
The UAS converts t to:
Via: SIP/2.0/UDP sip:192.168.0.100:5060;received=80.80.80.80
Now imagine the UAS replies a 404 but gets an ICMP error, so it must perform:
18.2.2 Sending Responses
o Otherwise (for unreliable unicast transports), 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, the procedures of Section 5 of [4]
SHOULD be used to determine where to send the response.
So finally it would send the response to IP 192.168.0.100:5060 that obviously
is unreachable for the UAS. Or worse, 192.168.0.100 could be the private LAN
of the UAS so the UAS would send the response to a host in its private LAN.
Isn't it a problem in some way?
Thanks.
--
Iñaki Baz Castillo
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