Hi there -Our environment:IPCC Enterprise - Rls. 7.5CUCM - Rls 7.1.3CUC - Rls 7.1.3Connectivity to the PSTN is through our Nortel PBX using 2 QSIG PRIWe an application that is using a DID number routed via the Nortel to the CUCM and then CVP (CTI rou...