Quadro2X behind a Cisco router. Router forwarding ports 5060, 6000 - 6001, 3478- 3479 and 4569 to the Quadro. We are able to call out on the Voip or FXOand receive calls on the FXO and route them to any extension. When calling the voip number from an analog line there is a long delay and then the message "The telephone you have called is unavailable". Sounds like it is coming from Telstra. I have connected a LinksysVOIP moden to the ITSP using the same settings, when this is done I can receive calls on the VOIP. I am running firmware version: 4.0.8/Release on the Quadro. Any help will be appreciated.