Dear All, I have a VOIP device connected behind the ISA server , just like an Ip phone connected inour internal network. For its working the TCP port 1100(both direction) and the UDP Port 1101(both direction) ahs to be mapped to the internal Ip address of the device. I tried by enabling NAT in the routing and remote access of windows 2000 server and I mapped the same, the device is working but that time ISA server get disabled means firewall service gets stopped. It is perfectly working if we are enabling the windows 2000 internet sharing . IS it possible to map such ports to the IP address of the internal device in a ISA Server Please give valuable suggestions for configuring this device