Inter-Tel
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Inter-Tel Axxess / Inter-Tel Axxess 8000 Series / Inter-Tel Axxent / Inter-Tel Eclipse
Intertel IMX 612
Intertel GLX Plus
Inter-Tel Axxent - From the attendant telephone
Inter-Tel Axxess - Networked Systems Only - From the attendant telephone
Inter-Tel Axxess - Non-Networked Systems - From the attendant telephone
Inter-Tel IMX 1224/2460