From: =?utf-8?q?I=C3=B1aki_Baz_Castillo?= <[EMAIL PROTECTED]>
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
You mean:
INVITE 80.80.80.80:5060
Via: SIP/2.0/UDP sip:192.168.0.100:5060
as there is no "from" in an INVITE.
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:
Your description leaves out many important details.
I assume that you mean "The UAS constructs a 404 response, but upon
sending it to 80.80.80.80:5060 the UAS receives an ICMP error."
You ask
Isn't it a problem in some way?
Yes, of course, because it doesn't work.
Presumably this is because either (1) your NAT isn't receiving packets
on the same address/port that it is sending on, or (2) the UAS doesn't
add the rport parameter to the Via when receiving requests (RFC 3581).
Dale
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