I am currently in the process of integrating a Cisco solution in with our existing Nortel environment. We have an Opt61 CS1000 Nortel with a PRI to a Cisco Voice Router to link the two systems. I am trying to figure out what type of signaling to use between the two. When we used NI2 we were able to make calls from Cisco to Nortel but not vice versa. When monitoring the Cisco device calls were not being presented from Nortel to it. We tried DMS 100 but cant get either system to talk to eachother. Any assistance would be greatly appreciated.