PABX Exchange: Capacity: Basic 2 CO Lines, 8 extensions (208), expand to 308, 416 External Line Caller ID Call Transfer ID PABX Exchange:Capacity: Basic 2 CO lines, 8 extensions (208), expand to 308, 416 Main Features:Switch power (optional)Backup battery interface (optional)Transfer caller ID (optional)Intercom caller ID (optional)Auto-attendant (DISA:10s one paragraphs)Auto-attendant (DISA:20s ...