AT&T Syn248 SB35010 - User Manual

Questions and Answers

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seancookSep 8, 2025
Why aren't the LEDs flashing on my AT&T Syn248 SB35010?
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  Thomas DavisSep 9, 2025
  If the Line-Status LEDs on your AT&T Telephone System do not flash red when the telephone line cords are plugged into the Gateway after power is switched on, the Gateway may not have performed calibration. Make sure an LAN cable is plugged into the port marked LAN.
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Richard WhiteSep 12, 2025
What does 'login to target device failed' mean on AT&T Telephone System?
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  Lance SullivanSep 12, 2025
  If the AT&T Telephone System WebUI displays “Login to target device failed,” the software version of the device you are currently logged into is no longer compatible with the software version of other devices within the network. Log on to the WebUI as administrator using the IP address of the device that caused the problem.
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Patrick WoodardSep 13, 2025
What to do if AT&T Telephone System has a blank screen?
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  Scott ThomasSep 13, 2025
  If your AT&T Telephone System has a blank screen or does not work, ensure the AC plug is plugged into an electrical outlet not controlled by a wall switch. Verify that the AC power outlet has power by plugging in another AC device. Also, verify that the DC plug is plugged into the power jack on the device. Note that the system devices are not immediately active when powered up; allow at least 30 seconds for the device to boot up. If it is a Gateway, check the LED status (the POWER LED should be GREEN). For Desksets connected to PoE, check whether any PoE switch ports have been configured for devices that require less power.
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Michele KochSep 14, 2025
How to make bypass jack work during power failure on AT&T Syn248 SB35010 Telephone System?
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  daniellebennettSep 14, 2025
  To ensure the bypass jack works during a power failure on your AT&T Telephone System, make sure an analog phone is plugged into the Bypass jack using a modular line cord.
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Tammy RogersSep 16, 2025
How to reset the AT&T Telephone System device?
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  smitherikaSep 17, 2025
  To reset an AT&T Telephone System device, use a pen or paper clip to press the RESET button. For a simple restart without losing your settings, press the button for less than five seconds. To completely reset to factory defaults, unplug the LAN cable and press the RESET button for more than five seconds. To reset the entire system, unplug LAN cables from all devices and press the RESET button for more than five seconds on each device.