att el51250 Manuel D’Utilisation

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I experience poor sound quality when using the speakerphone.
For increased sound quality while using the speakerphone, place the handset on a 
flat surface with the dial pad facing up.
When using a speakerphone, controlling background noise in your environment is 
essential. While you are listening to your party, press 
MUTE/
DELETE
 to temporarily 
turn your microphone off. When it is your turn to speak, remember to press  
MUTE/
DELETE
 again to turn the microphone on.
Excessive background noise will cause a speakerphone to fade in and out. Try 
controlling the background noise by turning off any audio devices near the 
speakerphone. Also, try to avoid interrupting the person at the other end of the 
conversation while the person is speaking. If background noise cannot be controlled, 
you should terminate speakerphone operation and return to normal handset mode.
I hear other calls while using my telephone.
Disconnect the telephone base from the telephone wall jack, and plug in a different 
telephone. If you still hear other calls, the problem is probably in your wiring or 
telephone service. Call your telephone service provider (charges may apply).
I subscribe to a nontraditional telephone service that uses my computer to establish 
connections, and my telephone doesn’t work.
Make sure your computer is powered on.
Make sure your Internet connection is working properly.
Make sure that the software is installed and running for your nontraditional 
telephone service.
Make sure to plug your USB telephone adapter into a dedicated USB port on your 
computer. Do not plug into a multiple port USB hub (USB splitter) that is not powered.
In a few rare instances, the USB port on your computer may not have enough power.  
In these instances, try using a USB hub with its own external power supply.
If you are using a firewall, it may prevent access to your nontraditional telephone 
service. Contact your service provider for more information.