One Talk T77LTE Smart Desk Phone

Package Contents

The following items are included in your package:

• Phone
• Handset
• Stand
• Wall-mount bracket (optional)
• Power adapter
• Ethernet Cable (2m CAT5E UTP Cable) (optional)
• Handset cord
• Quick start guide

Assembling the Phone

1. Desk-mount

Attach the Stand:

[Diagram description: Shows attaching the stand to the phone base in two different angle configurations, labeled 'Low-Angle side up' and 'Another side up', with angles 41° and 46° indicated.]

Wall Mount Method

[Diagram description: Illustrates attaching the phone to a wall mount bracket.]

2. Connect Cables

[Diagram description: Shows the back of the phone with ports labeled 'DC12V', 'Internet', and 'BN/MAC'. It illustrates connecting the Power Adapter (DC 12 V/2 A) and an Ethernet cable.]

Note: The T77LTE Desk phone should be used with the Yealink original power adapter (12 V/2A) only. The use of a third-party power adapter may cause damage to the phone.

3. Optional: Connect USB Devices

[Diagram description: Shows a USB port and an arrow indicating connection to the phone.]

Note: The USB port (5 V/1A) can also be used to connect other USB devices.

Getting to Know Your Device

[Diagram description: A diagram of the One Talk T77LTE Smart Desk Phone showing key components: Speaker, Transfer Key, Hold Key, Message Key, Volume Key, Keypad, Reversible Tab (secures the phone when mounting), Power LED Indicator, Touch Screen, USB Port (on back), Headset Key, Mute Key, Redial Key, Speakerphone Key.]

Starting the Phone

Once the phone is powered on, it will automatically begin the initialization process and connect to the 4G network. The phone will go through a series of screens and update the firmware on the device. The first-time setup process takes about 15 minutes and should not be interrupted. You will know the phone is ready for use when the 911 address appears on the screen of the device. If that address is missing or is inaccurate, please contact your administrator immediately. It is critical that the address be accurate, because this is the location that will be given to emergency personnel when you dial 911.

[Diagram description: Shows the phone's touch screen displaying a 'NOTIFICATION' with a 911 address. The screen shows 'No Service', 'OB/s HD 4G', and a notification box stating "The current address of this phone in Verizon's systems is: One Verizon Way, Basking Ridge, NJ 07920. This location will be provided to emergency response personnel when dialing 911. If the address above is incorrect, please update it in My Verizon, ask your business administrator to update it in My Business, or call Verizon Customer Care." Buttons for 'Exit', 'Call', 'Contact', 'History' are visible.]

Using the Touch Screen

By default, the LTE Desk phone supports three idle screens. The home screen displays as below:

[Diagram description: Shows the phone's touch screen displaying the time (17:54), date (Wed Feb 26), status bar with 'No Service', 'OB/s', 'HD', '4G'. Icons for 'Features', 'Call', 'Contact', 'History' are visible at the bottom, with labels 'Phone Dialer', 'Directory', 'History'.]

To navigate the touch screen:

• Swipe left or right to switch among different idle screens.

Status Icons

Control Center and Notification Center

Swipe down from the top of the screen to enter the control center and the notification center.

[Diagram description: Shows the phone's screen with the 'Control Center' on the left and 'Notification Center' on the right. The Control Center displays icons for Airplane mode, DND, WIFI, Bluetooth, Wireless AP, Silence, Call Forward, Screenshot, USB, Device settings, and a brightness slider. The Notification Center shows the time (16:55 Wed Feb 26) and a 'No notification' message.]

Notification Icons

Notification Center Actions:

• To delete all notifications, tap ?️.
• To delete a specific notification, swipe left or right.
• To view the details, tap the desired notification message.

Basic Call Features

Placing a Call

Using the handset:

1. Pick up the handset.
2. Enter the number, and then tap ?.

Using the speakerphone:

1. With the handset on-hook, press ?.
2. Enter the number, and then tap ?.

Using the headset:

1. With the headset connected, press ? to activate the headset mode.
2. Enter the number, and then tap ?.

Note: During a call, you can alternate between the headset, hands-free speakerphone, and handset modes by pressing the Headset key, the Speakerphone key, or by picking up the handset. Headset mode requires a connected headset.

Answering a Call

• Using the handset: Pick up the handset or tap ?.
• Using the speakerphone: Press ?.
• Using the headset: Press ?.

Note: You can reject an incoming call by tapping ❌.

Ending a Call

• Using the handset: Hang up the handset or tap ?.
• Using the speakerphone: Tap ?.
• Using the headset: Tap ?.

Redial

• Press ↩️ to enter the placed call list, tap the desired entry.
• Press ↩️ twice when the phone is idle to dial out the last dialed number.

Call Mute and Un-mute

• Tap ? to mute the microphone during a call.
• Tap again to un-mute the call.

Call Hold and Resume

To place a call on hold:

• Tap ⏸️ during an active call.

To resume the call, do one of the following:

• If there is only one call on hold, tap ▶️.
• If there is more than one call on hold, select the desired call, and then tap ▶️.

Call Transfer

You can transfer a call in the following ways:

Direct Transfer

1. Press or tap More > Transfer during an active call. The call is placed on hold.
2. Enter the number you want to transfer to.
3. Tap ➡️ Transfer.

Semi-Attended Transfer

1. Press or tap More > Transfer during an active call. The call is placed on hold.
2. Enter the number you want to transfer to, and then tap +.
3. Press ➡️ when you hear the ring-back tone.

Consult Transfer

1. Press or tap More > Transfer during an active call. The call is placed on hold.
2. Enter the number you want to transfer to, and then tap +.
3. Tap ➡️ Attended Transfer.

Call Forward

To enable call forward:

1. Swipe down from the top of the screen and tap Call Forward.
2. Select the desired forward type:
   • Always Forward – Incoming calls are forwarded unconditionally.
   • Busy Forward – Incoming calls are forwarded when the phone is busy.
   • No Answer Forward – Incoming calls are forwarded if not answered after a period of time.
3. Enter the number you want to forward to. For No Answer Forward, select the desired ring numbers to wait before forwarding from the Number of Rings field.
4. Tap the Save ? to accept the change.

Call Conference

1. Tap ? during an active call. The call is placed on hold.
2. Enter the number of the second party, and then tap Invite.
3. When the second party answers, all parties are now joined in the conference.
4. Tap ? to disconnect all parties.

Speed Dial

To configure a speed dial key:

1. Do one of the following:
   • Long tap the desired DSS key when the phone is idle, and then select Edit.
   • Tap Settings > Dsskey, and select the desired DSS key.
2. Select SpeedDial from the Type field, select the desired line from the Account ID field, enter a label in the Label field, and then enter the number in the Value field.
3. Tap Save ? to accept the change.

To use the speed dial key:

• Tap speed dial key to dial out the preset number.

Voice Message

Message waiting indicator on the idle screen indicates that one or more voice messages are waiting.

To listen to voice messages:

1. Press ? or tap the Connect.
2. Follow the voice prompts to listen to your voice messages.

Customizing Your Phone

Call History

1. Tap History when the phone is idle, scroll through the list.
2. You can do the following:
   • Tap the entry to call the entry directly.
   • If you tap ⋮, you can do the following:
     • Select the desired entry, and then tap Delete ❌.
     • Tap Delete All to delete all entries from the list.
     • Select the desired entry, and then tap Move to Blocklist.
   • If you tap ℹ️ behind the entry, you can do the following:
     • View detailed information about the entry.
     • Tap ? to add the entry to the local directory.
     • Tap ❌ to delete entry from the list.

Contact Directory

To add a contact:

1. Tap Contact when the phone is idle, and then select the desired directory.
2. Tap Add Contact to add a contact.
3. Enter a unique contact name in the Name field and contact numbers in the corresponding fields.
4. Tap OK ✔️ to accept the change.

To edit a contact:

1. Tap Contact when the phone is idle, and then select the desired directory.
2. Select the desired contact, and then tap ✏️.
3. Edit the contact information.
4. Tap OK ✔️ to accept the change.

To delete a contact:

1. Tap Contact when the phone is idle, and then select the desired directory.
2. Select the desired contact, and then tap ❌.
3. Tap OK ✔️ when the LCD screen prompts "Delete selected item?".

Note: You can add contacts from call history easily. For more information, refer to Call History above.

Volume Adjustment

• Press + during a call to adjust the receiver volume of the handset/speakerphone/headset.
• Press + when the phone is idle or ringing to adjust the ringer volume.
• Press + to adjust the media volume in the corresponding screen.

Ring Tones

1. Tap Call when the phone is idle, and then select > Ring Tones > Ring Tones.
2. Select and tap the desired account.
3. Select the desired ring tone.
4. Tap Save ? to accept the change.

Regulatory Notices

Operating Ambient Temperatures

• Operating temperature: +32 to 104°F (0 to 40°C)
• Relative humidity: 5% to 90%, noncondensing
• Storage temperature: -22 to +158°F (-30 to +70°C)

Warranty

Verizon's product warranty is limited only to the unit itself, when used normally in accordance with the operating instructions and the system environment. Verizon is not liable for damage or loss resulting from the use of this product, or for any claim from a third party. Verizon is not liable for problems with Yealink devices arising from the use of this product; Verizon is not liable for financial damages, lost profits, claims from third parties, etc., arising from the use of this product.

Explanation of Symbols

• DC symbol (Apply for DC powered products): ⚡ is the DC voltage symbol.
• WEEE Warning symbol: ♻️ To avoid the potential effects on the environment and human health as a result of the presence of hazardous substances in electrical and electronic equipment, end users of electrical and electronic equipment should understand the meaning of the crossed-out wheeled bin symbol. Do not dispose of WEEE as unsorted municipal waste and have to collect such WEEE separately.

Restriction of Hazardous Substances Directive (RoHS)

This device complies with the requirements of the EU RoHS Directive. Statements of compliance can be obtained by contacting support@yealink.com.

Safety Instructions

Save these instructions. Read these safety instructions before use!

General Requirements

• Before you install and use the device, read the safety instructions carefully and observe the situation during operation.
• During the process of storage, transportation, and operation, please always keep the device dry and clean, avoid collision and crash.
• Please attempt not to dismantle the device by yourself. In case of any discrepancy, please contact the appointed maintenance center for repair.
• Please refer to the relevant laws and statutes while using the device. Legal rights of others should be respected as well.

Environmental Requirements

• Do not cover ventilation openings; this equipment is not intended to be used on soft support.
• The marking information is located at the exterior of the bottom.
• Place the device at a well-ventilated place. Do not expose the device under direct sunlight.
• Keep the device dry and free of dusts.
• Do not place the device on or near any inflammable or fire-vulnerable object, such as rubber-made materials.
• Keep the device away from any heat source or bare fire, such as a candle or an electric heater.

Operating Requirements

• Do not let a child operate the device without guidance.
• Do not let a child play with the device or any accessory in case of accidental swallowing.
• Please use the accessories provided or authorized by the manufacturer only.
• The power supply of the device shall meet the requirements of the input voltage of the device. Please use the provided surge protection power socket only.
• Before plugging or unplugging any cable, make sure that your hands are completely dry.
• Do not spill liquid of any kind on the product or use the equipment near water, for example, near a bathtub, washbowl, kitchen sink, wet basement, or near a swimming pool.
• During a thunderstorm, stop using the device and disconnect it from the power supply. Unplug the power plug and the Asymmetric Digital Subscriber Line (ADSL) twisted pair (the radio frequency cable) to avoid lightning strike.
• If the device is left unused for a rather long time, disconnect it from the power supply and unplug the power plug.
• When there is smoke emitted from the device, or some abnormal noise or smell, disconnect the device from the power supply, and unplug the power plug immediately.
• Contact the specified maintenance center for repair.
• Do not insert any object into equipment slots that is not part of the product or auxiliary product.
• Before connecting a cable, connect the grounding cable of the device first. Do not disconnect the grounding cable until you disconnect all other cables.

Cleaning Requirements

• Before cleaning the device, disconnect it from the power supply.
• Use a piece of soft, dry, and anti-static cloth to clean the device.
• Keep the power plug clean and dry.

Battery Precautions (Apply for lithium battery products)

• Do not immerse the battery into water, which could short-circuit and damage the battery.
• Do not expose the battery to an open flame or leave the battery where it could be subjected to extremely high temperatures, which could cause the battery to explode.
• Do power the handset off before removing the battery.
• Do not try to use the battery for the power supply of any device other than this device.
• Do not open or mutilate the battery; released electrolyte is corrosive and may cause damage to your eyes or skin.
• Use only the rechargeable battery pack delivered with the device or those rechargeable battery packs expressly recommended by Yealink.
• Defective or exhausted battery should never be disposed of as municipal waste. Return old battery to the battery supplier, a licensed battery dealer, or a designated collection facility.

Troubleshooting

The unit cannot supply power to Yealink device.

There is a bad connection with the plug.

1. Clean the plug with a dry cloth.
2. Connect it to another wall outlet.

The usage environment is out of operating temperature range.

1. Use in the operating temperature range.

The cable between the unit and the Yealink device is connected incorrectly.

1. Connect the cable correctly.

You cannot connect the cable properly.

1. You may have connected a wrong Yealink device.
2. Use the correct power supply.

Some dust, etc., may be in the port.

1. Clean the port.

Contact your dealer or authorized service facility for any further questions.

FCC Statement

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

The equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

The following applies to products using Wi-Fi 5GHz 5150-5350 MHz:

The device for operation in the band 5150-5250 MHz is only for indoor use to reduce the potential for harmful interference to co-channel mobile satellite systems.

The following applies to products used at a distance greater than 20cm:

The equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. The equipment should be installed and operated with minimum distance 20cm between the radiator and your body.

© 2025 Verizon. VZGD2870425