Hi All, I am trying to initiate the Net2phone utility using seperate Software provided by the Vendor here. Iam not able to get through behind the Firewall. THe S/w says that session Intiating protocol is required to make the call which uses the well known port no. for SIP is 5060. I have enabled both TCP and UDP port No's for 5060 both Inbound and Outbound but its not getting through. How do we configure for this SIP port 5060 to pass thru ISA. Please advice. Iam trying this configuration behind a secure NAT client. Regards, Vinay.