Abstract: Dynamic reconfiguration of T1 access channels to various Nodal (network) services can be realized by applying carefully devised trunk-conditioning signals to disconnected channels to provide proper system responses and prevent billing errors as well as unwanted alarm conditions. Trunk-conditioning with specific signals in binary sequences are defined for Terminal lines and Private Branch Exchange ("PBX") lines for the popular signalling type of E&M, LS, GS and PLAR. A steady idle signal is recommended for Terminal line conditioning; and a short duration of idle signal followed by a steady busy signal for inter-switch applications (eg. PBX to 4ESS.TM.) while loss of connectivity exists. This technique can be used in implementing the RINA service function for services offered by AT&T and any similar service provider. The service function will allow for greater access flexibility and better utilization of access bandwidth as well as network services.