We have an Option 61C and have added a Cisco 2811 Gateway. We are having trouble transferring an outside call from a Nortel phone to any of our Cisco voip phones. I can do this with my two Nortel maintenance phone because the cls is FTTU. Everyone else is set to FTTC. What kind of problems will I open up if everyone is changed to FTTU or even FTTR? I thought FTTC was done as part of a security issue for our trunks. Has anyone had this issue before?