4BRI module provides 4 BRI interfaces which can be configured to work in NT or TE mode. It can be installed on U80 and U100V2 but not U50V2. On U80 and U100V2 only one 4BRI module can be installed. And if it’s going to be installed with other modules (4FXO, 4FXS, 2FXOS, 2/4GSM, 2/4WCDMA modules), it should be installed on SLOT2. 4BRI cannot be installed with E1 module on the same U80 or U100V2. For more information of this module please refer to the link below: http://www.zycoo.com/files/upload/CooVox-4BRI E1/T1 module provided a RJ48 interface which could be configured to work in E1 (PRI-NET, PRI-CPE, R2, SS7 signaling) and T1 mode. You can install 2 E1/T1 modules on both U80 and U100V2. If it’s going to be installed with other modules (4FXO, 4FXS, 2FXOS, 2/4GSM, 2/4WCDMA) it should be installed on SLOT2. And E1/T1 module cannot be installed with BRI module on the same U80 or U100V2. For more information of this module please refer to the link below: http://www.zycoo.com/files/upload/CooVox1PRI%20Module%20Datasheet.pdf ZYCOO CooVox V2 Series IP Phone System Admin User Guide v3.0.1 7-8ZYCOO CooVox V2 Series IP Phone System Admin User Guide v3.0.1 Mechanical Design CooVox-U20V2 Front Panel CooVoxU20V2 Rear Panel 1 * Reset Button 1 * Power Interface (DC 12V 2A) 2 * Ethernet Interface (WAN/LAN:10/100Mbps) 2 * Analog Ports(FXO/FXS) 1 * ANT Port (GSM) 1 * USB Interface (for storage) 1 On Power on Off Power off Hardware installation of each model is documented in the “Quick Installation Guide”, and the guide was packed with each of the IPPBX package. Please refer to the guide to install the unit in to your local LAN. Please pay attention to the safety notices during the hardware installation process. Quick Setup Wizard Quick Setup Wizard is especially designed on v3.0.0 software for CooVox V2 series IPPBXs to help you quickly and easily setup your IPPBX system within minutes. When you open the Web UI of a new unit with factory default settings, Quick Setup Wizard will be presented. You may follow the wizard to complete some basic settings or you may skip the wizard and login with default credentials. Username: