Appendix A

Replacing a handset

You may need to deregister your handsets if:

You have twelve registered handsets and need to replace a unit.

-OR-

You wish to change the designated handset number of your registered handsets.

You must first deregister ALL the handsets, and then re-register each handset you wish to use.

Please read carefully through all the instructions on this page before beginning the deregistration process.

To deregister all handsets

1.Press and hold HANDSET LOCATOR on the telephone base

for about 10 seconds (until the IN USE light turns on and starts to flash), then release the HANDSET LOCATOR button.

2.Immediately press and release HANDSET LOCATOR again. You must press HANDSET LOCATOR while the IN USE light is still flashing. (The light flashes for about seven seconds. If the light stops flashing, pick up the handset and place it back into the telephone base, then start again with step one above.)

3.The handset(s) will show SEARCHING FOR BASE and it will take about 10 seconds to complete the deregistration process. ALL handsets will show NOT REGISTERED if deregistration was successful.

4.To re-register the handset(s) to the telephone base, follow the registration instructions on page 11.

NOTES:

1.If the deregistration process was not successful, you may need to reset the system and try again. To reset: pick up the handset and press the HOME/FLASH button, then press the OFF/CLEAR button and place the handset back into the telephone base. You may also reset by unplugging the power from the telephone base and plugging it back in.

2.You cannot deregister the handset(s) if any other system handset is in use.

3.Even if the battery is depleted, you can still deregister the handset by following the steps above. After the handset is charged for at least 10 minutes, the screen shows NOT REGISTERED.

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AT&T TL90078 user manual Replacing a handset, You may need to deregister your handsets if
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TL90078 specifications

The AT&T TL90078 is a highly acclaimed IP Phone that caters to the needs of modern businesses seeking reliable communication solutions. Designed with a focus on versatile functionality and ease of use, the TL90078 offers a range of features that enhance productivity in a corporate environment.

One of the standout characteristics of the TL90078 is its user-friendly interface. The IP phone is equipped with a large backlit display that allows for clear visibility, making it easier to navigate through menus, access contacts, and manage calls. This intuitive design aids users in efficiently handling their communication needs without unnecessary complications.

The TL90078 supports multiple line appearances, enabling users to manage several calls simultaneously. This feature is particularly valuable in busy office settings where efficient call management is crucial. Furthermore, the phone is compatible with both standard and high-definition audio, ensuring that conversations are crisp, clear, and free from disruptions.

In terms of connectivity, the TL90078 is designed to integrate seamlessly into existing VoIP infrastructures. It supports both Power over Ethernet (PoE) and traditional power options, providing flexibility in installation. This versatility means businesses can deploy the phone in various office layouts without the need for extensive wiring or modifications.

The device also incorporates advanced call management features, such as call forwarding, call waiting, and conference calling, allowing teams to collaborate effortlessly. The integration of productivity-enhancing applications further transforms the TL90078 into a powerful communication tool, with options for voicemail, speed dialing, and directory access directly from the handset.

Security is another critical aspect of the TL90078. The phone employs encryption protocols to protect sensitive communications, ensuring that businesses can operate securely without compromising on their data integrity.

In summary, the AT&T TL90078 is a robust IP phone that combines a user-friendly design with advanced features and technologies tailored for professional use. Its versatility, audio quality, and security capabilities make it a valuable asset for businesses aiming to enhance their communication systems. As organizations continue to adapt to evolving communication needs, the TL90078 stands out as a reliable choice in the competitive landscape of VoIP solutions.
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