Hi,
RFC 3261 says (like assuming NAT doesn't exist) that when a UDP request
arrives to an UAS, replies must be sent to the Via "received" address (real
source IP) and the port indicated in "sent-by". In the real world full of
NAT's it needs the "rport" complement.
Hi, imagine a SIP UDP UAS that, instead of implementing RFC 3581 ("rport"),
just replies *always* using the real incoming source UDP address:port.
Could it generate any issue? Note that in TCP replies must be sent using the
incoming connection (this involves real source IP and real source port), but
in UDP it just involves real source IP, that IMHO makes no sense (why just
the IP?).
Other way to ask the same would be: does really exist any case in which
replying to real source IP but not to the real source port (this is, port
in "sent-by") is useful?
Thanks.
--
Iñaki Baz Castillo
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