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The Release Link Trunk (RLT) feature utilizes the Two-Bearer Channel Transfer (TBCT) technique for ISDN NI2 to off load two B-Channels which are bridged or looped on the IMG 2020. If there are two calls active on the IMG 2020 and they are bridged or looped together the resources on the IMG 2020 are being used inefficiently. The TBCT feature has the ability to send specific facility messages back to the Stored Program Control Switch (SPCS) on the PBX or TDM switch and tell the PBX/TDM switch to connect these two calls together so they are no longer active on the IMG 2020. This would effectively open up two B-Channels that were initially being utilized. Below is information on how TBCT is utilized and configured.
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