Panasonic KX-TDA50G Hybrid IP PBX Control Unit Multi-Cell Wireless. Toll Restriction. VOIP Gateway with QSIG (Enhanced System Networking). PC Based Programming.Caller ID Name and Number to (DPT, APT, & SLT). DXDP (Digital Extra Device Port). Voicemail Integration. Uniform Call Distribution (UCD). Automatic Route Selection (ARS). Direct Inward System Access (DISA). Compatible with KX-T7600, 7400, 7700 Series and SLT Telephones.