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The phone is dual mode
The Adtran 1200288L2 is a controller card for the Adtran MX2800 M13 multiplexer
Switching Capacity: 136 Gbps
Adtran 4200321L1 Features:
The Alti-IP600H features a speakerphone and message waiting light
ESI 24EL (5000-0456) Intelligent VoIP Card Condition:Refurbished The phone is dual modeESI 24EL Intelligent VoIP Card Description: The ESI 24EL (5000 0456) is an intelligent VoIP card which converts VoIP standards to PSTN. The ESI 24EL (5000 0456) Intelligent VoIP Card has a single 10 100 Mbps LAN port for connecting this module to your network. The ESI 24EL card's main feature is twenty four ESI Link Connections which are designed specifically for the ESI Communication Servers listed below. ESI 5000 0456 Features: 24 ESI Link
