Panasonic KX-TG1711TUB Cordless telephone
Key Features:

• LCOT6 card for connecting external analog lines
• Compatible with network servers KX-NS500 & KX-NS520
• Equipped with 3 RJ45 slots
• Maximum capacity of up to 48 lines
• Supports FSK & DTMF Caller ID
• Built-in feature to detect reverse polarities
• Capable of detecting damaged lines
• Two emergency ports for operation during power outage
• Adds 6 Analog External Lines (Max 48 Lines)