Internet Call Software Im Using D-link Router 5242b And I Think My Router Firewall Is Blocking The Nymgo Internet Calling Software An?

Im using d-link router 5242b and i think my router firewall is blocking the nymgo internet calling software an? - internet call software

In the 5242b with a D-Link router and I think my router firewall nymgo blocked internet telephony software, and if I disable enable (Full Cone NAT) firewall on the router i can think works.thats. Can U please tell me how this software to access through the firewall nymgo.