AT&T EL51200, EL51250, EL51400, EL51300 Experience poor sound quality when using the speakerphone

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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.

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Contents Quick start guide Canada version Introduction Parts checklist Important Information InstallationCharge light Battery installationBattery charging Battery indicators Battery status ActionHandset X at least REDIAL/PAUSE Handset overviewTelephone base overview Menu structure Menu overviewTelephone settings Ringer volumeDate and time Answering a call Making, answering and ending a call Making a callEnding a call SpeakerphoneJoin a call in process Options while on a call Volume controlChain dialing RedialHandset locator Voicemail waiting visual message waiting indicatorIntercom To make and answer an intercom call Call transfer using intercomDirectory Directory overview Storing names and numbersTo review directory entries To edit a directory entry To dial a directory numberTo delete a directory entry Speed dialCaller ID history call log Caller ID overviewTo review the caller ID history To dial a number from the caller ID historyMy telephone doesn’t work at all TroubleshootingMy cordless handset isn’t performing normally Charge light is off Experience poor sound quality when using the speakerphone Important safety information Especially about telephone answering systems Industry Canada FCC Part 68 and ActaFCC Part Limited warranty What does this limited warranty cover?How long is the limited warranty period? Other limitations How do you get warranty service?Technical specifications