We're running an S8700 with software version R012x.01.0.411.7 and are trying to set up an E1 connecting us to a Lucent 5ESS. They're telling me I need to match up with their ISUP7N incoming and outgoing signaling type and TRKCCS7 NATRK trunk class but I'm not sure which of my ISDN settings are the right ones. Any help is greatly appreciated.