I have an issue with 2 routers (800 Series), they are configured as VPN endpoints (IPSec) and also as Internet Gateways (NAT & Inspect Rules).
VPN tunnels are on a site-to-site topology (working fine).
I am running VoIP on both sides with 2 Alcatel PBXs using h323 protocol (There is no problem with that communication).
The problem is when my Alcatel IP Phones, from one site, try to connect to the TFTP Server on other PBX in the other site. They show an error saying that the "TFTP connection has failed". I can do ping against the ip address of the TFTP server and I know it is working because other phones at local site dont have problems.
My question is: where is the problem?, IPSec Config? NAT? IP Inspects? or the combination of all?
How can I achieve to allow ALL Traffic and/or ALL Ports from one inside network to another while bringing internet connectivity to inside users? without restricctions on my protected networks and having a good security.
I would like to paste my config files if you need them...
Thank you in advance,