First of all, thanks for replying, it's clear now.
I have one more question related to this:
Imagine a host behind NAT with IP 192.168.22.33 which has an application on port 5060 ( a sip client) and opens a connection to a server outside the NAT (the sip registrar with IP 130.11.22.33 on port 5060), and consider that the NAT box translates the SIP client src_ip to 129.11.22.33 and src_prt to 5054, for this communication.
The SIP registrar is able to reach the SIP client running on 192.168.22.33:5060 by using 129.11.22.33:5054, but what about other hosts on the Internet? Will they also be able to reach the SIP client using the pair 129.11.22.33:5054, or only packets coming from the SIP registrar be accepted?
Thanks again
Filipe Abrantes
-- Filipe Lameiro Abrantes INESC Porto Campus da FEUP Rua Dr. Roberto Frias, 378 4200-465 Porto Portugal
Phone: +351 22 209 4266 E-mail: fla@xxxxxxxxxxxxx
