Contents

Table of Contents
Before You Begin
- Related Documentation
Getting Started
- Hardware Overview
  - T48S/T48G Hardware
  - T46S/T46G/T42S/T42G/T41S/T41P/T40P/T40G Hardware
  - Power LED Indicator
  - Line Key LED
- Screen and Icons
  - Idle Screen
  - Calls Screen
  - Icons in the Status Bar
    - T48S/T48G Icons in the Status Bar
    - T46S/T46G Icons in the Status Bar
    - T41S/T41P/T42S/T42G Icons in the Status Bar
    - T40P/T40G Icons in the Status Bar
  - Line Key Icons
    - T48S/T48G Line Key Icons
    - T46S/T46G Line Key Icons
    - T42S/T42G/T41S/T41P Line Key Icons
    - T40P/T40G Line Key Icons
- Entering Characters on T48S/T48G
  - Using the Onscreen Keyboard
  - Using the Phone Keypad and Dial Pad
- Entering Characters on T46S/T46G/T42S/T42G/T41S/T41P/T40P/T40G
Call Features
- Changing the Default Account
- Placing Calls
  - Placing a Call from the Dialer
  - Placing Multiple Calls
  - Placing a Call with a Speed Dial Key
  - Placing a Call Back to the Last Incoming Number
  - Redialing a Number
  - Dialing a Hotline Number
  - Placing an International Call
  - Placing a Call from the Call History
  - Placing a Call from the Directory
  - Placing an Anonymous Call
  - Placing Calls to Google Contacts
  - Placing an Emergency Call from a Locked Phone
- Answering Calls
  - Answering a Call
  - Answering a Call When in a Call
  - Answering a Call Automatically
- Switching Among the Handset, Speakerphone and Headset Modes
- Disabling Call Waiting
- Silencing or Rejecting Incoming Calls
  - Silencing a Call
  - Rejecting a Call Manually
  - Rejecting Anonymous Calls
  - Rejecting Calls with Do Not Disturb (DND)
    - Rejecting Calls with DND on All Lines
    - Rejecting Calls with DND on a Specific Line
    - Deactivating DND
- Ending Calls
- Redialing a Call Automatically
- Muting/Unmuting Audio
- Keep Mute
- Holding and Resuming Calls
  - Holding a Call
  - Resuming a Held Call
- Redirecting Incoming Calls
  - Forwarding All Incoming Calls to a Contact
    - Forwarding All Incoming Calls on All Lines
    - Forwarding All Incoming Calls on a Specific Line
    - Deactivating Call Forward
  - Forwarding an Incoming Call Manually
  - Forwarding Incoming Calls with a Forward Key
  - Diverting Calls to a Contact
- Transferring Calls
  - Performing a Blind Transfer
  - Performing a Semi-Attended/Attended Transfer
  - Performing Transfer with a Transfer Key
    - Setting a Transfer Key
    - Performing a Blind Transfer Using a Transfer Key
    - Performing a Semi-attended/Attended Using a Transfer Key
    - Performing a Call Transfer by Selecting a Transfer Mode
- Conference Calls
  - Local Conference
    - Setting Up a Local Conference Call
    - Merging Two Calls into a Conference
    - Inviting a Transfer Target and a Transferee into a Conference
    - Holding or Resuming a Conference Call
    - Muting or Unmuting a Conference Call
    - Splitting a Conference Call
    - Managing Conference Participants
    - Ending a Conference Call
  - Network Conference
    - Setting Up a Network Conference
- Recording Using a USB Flash Drive
  - Recording a Call
  - Pausing/Resuming a Recording
  - Stopping a Recording
  - Managing the Recordings
    - Listening to a Recording
    - Pausing/Resuming a Playback
    - Fast Forwarding/Rewinding a Playback
    - Deleting a Recorded Call
  - Viewing the Available Recording Time
- Multicast Paging
  - Sending Multicast Paging
    - Setting a Multicast Paging Key
    - Sending a Paging by a Multicast Paging Key
    - Setting a Paging List Key
    - Setting a Paging Group
    - Sending Pages by a Paging List Key
    - Deleting a Paging Group
  - Receiving Multicast Paging
  - Managing a Paging Call
Advanced Call Features
- Using Call Completion
- Call Pickup
  - Picking up a Call Directly
  - Picking up a Group Call Directly
  - Picking up a Call with a Pick Up Key
  - Picking up a Call with a Group Pickup Key
- Call Park and Call Retrieve
  - Parking or Retrieving a Call in the FAC Mode
    - Parking a Call in the FAC Mode
    - Retrieving a Parked Call in the FAC Mode
  - Parking or Retrieving a Call in the Transfer Mode
    - Parking a Call in the Transfer Mode
    - Retrieving a Parked Call in the Transfer Mode
  - Parking or Retrieving a Call with a Park or Retrieve Key
    - State Indicator of the Park/Retrieve key
    - Parking a Call using a Park Key
    - Retrieving a Parked Call using a Retrieve Key
- Busy Lamp Field (BLF)
  - State Indicator of Remote Line by BLF Key
  - Audio Alert for BLF Pickup
    - Setting an Alert Tone for Monitored Lines
  - Visual Alert for BLF Pickup
  - Setting a BLF Key
  - Picking up a Remote Call by BLF Key
  - Transferring a Call by BLF Key
    - Performing a Blind Transfer
    - Performing a Semi-attended/Attended Transfer
  - Parking or Retrieving a Call by BLF Key
    - Parking a Call to a Monitored Line
    - Retrieving a Parked Call
- BLF List
  - State Indicator of Remote Line by BLF List Key
  - Audio Alert for BLF Pickup
    - Setting an Alert Tone for Monitored Lines
  - Visual Alert for BLF Pickup
  - Ring Type for BLF Parked Call Monitor
    - Setting an Alert Tone for the BLF Parked Call Monitor
  - Visual Alert for BLF Parked Call Monitor
  - Picking up a Remote Call by BLF List Key
  - Transferring a Call by BLF List Key
    - Performing a Blind Transfer
    - Performing a Semi-attended/Attended Transfer
  - Parking a Call by a BLF List Key
  - Retrieving a Call by a BLF List Key
  - Barging in an Active Call by BLF List Key
  - Retrieving a Call Parked to the Monitored Line
- Shared Line
  - State Indicator of Shared Line
  - Placing Calls on a Shared Line
  - Answering Calls on a Shared Line
  - Placing a Call on Public Hold
  - Placing a Call on Private Hold
  - Retrieving a Held Call on a Shared Line
  - Barging in an Active Call on a Shared Line
  - Pulling a Shared Call on a Shared Line
- Intercom
  - State Indicator of the Intercom key
  - Placing an Intercom Call
  - Picking up an Incoming Call of the Target Extension
  - Answering an Intercom Call
- Short Message Service (SMS)
  - Reading a Text Message
  - Sending a Text Message
  - Replying to a Text Message
  - Deleting a Text Message
- Voice Mail
  - Setting the Voice Mail Code
  - Leaving Voice Mails
  - Listening to Voice Mails
- Using the Hot Desking
- Automatic Call Distribution (ACD)
  - State Indicator of ACD User
  - Logging into the ACD System
  - Changing the ACD Status
Directory
- Local Directory
  - Managing the Local Directory Groups
    - Adding Contact Groups
    - Editing Contact Groups
    - Deleting Contact Groups
  - Managing the Local Directory Contacts
    - Adding Contacts
    - Viewing Contacts
    - Editing Contacts
    - Deleting a Contact
    - Deleting All Contacts
  - Moving a Local Directory Contact to Blacklist
  - Searching for Contacts
- Favorites
  - Adding Favorites
    - Adding an Existing Contact to Your Favorites
    - Adding a New Contact to Your Favorites
  - Viewing Favorites
  - Reordering Favorites
  - Deleting Favorites
- Blacklist
  - Adding a Blacklist Contact
  - Viewing Blacklist Contacts
  - Editing a Blacklist Contact
  - Deleting Blacklist Contacts
    - Deleting a Blacklist Contact
    - Deleting All Blacklist Contacts
  - Moving a Blacklist Contact to the Local Directory
- Mobile Contacts
  - Saving a Mobile Contact to the Local Directory
  - Searching for Mobile Contacts
  - Updating the Mobile Contacts
- Google Contacts
  - Viewing Google Contacts
  - Updating Google Contacts
  - Searching for Google Contacts
- Remote Phone Book
  - Searching for Remote Phone Book Contacts
  - Viewing Remote Phone Book Contacts
  - Saving a Remote Phone Book Contact to the Local Directory
  - Saving a Remote Phone Book Contact to the Blacklist
Call History
- Call History Icons
- Viewing History Records
- Saving a History Record to Local Directory
- Saving a History Record to Blacklist
- Deleting History Records
  - Deleting a Call Record
  - Deleting All Call Records
- Disabling History Record
Customizing Your Phone
- Changing the Administrator Password
- Wallpaper
  - Changing Wallpaper on Idle Screen
  - Changing Wallpaper on Dsskey Screen
  - Adding a Wallpaper from a USB Flash Drive
  - Adding a Dsskey Screen Wallpaper from a USB Flash Drive
- Adjusting Transparency
- Screen Saver
  - Changing the Waiting Time for Screen Saver
  - Disabling Time & Date and Status Icons Display
  - Adding a Screen Saver from a USB Flash Drive
  - Setting the Screen Saver Type
- Changing the Backlight and Time
- Adjusting the Screen Contrast
- Changing the Language
- Time & Date
  - Setting the Time and Date Manually
  - Changing the Time and Date Format
- Setting a Key as Send
- Customizing the Soft Keys
- Phone Lock
  - Setting the Phone Lock
  - Locking Your Phone Manually
  - Unlocking Your Phone
  - Changing Your Phone Unlock PIN
- Extending the Line Key Labels
- Locking the Line Key
Audio Settings
- Adjusting the Volume
- Setting the Ring Tone
  - Setting a Ring Tone for the Phone
  - Setting a Ring Tone for an Account
  - Setting a Ring Tone for a Group
  - Setting a Ring Tone for a Contact
- Disabling the Key Tone
Optional Accessories with Your Phone
- Headset
  - Connecting the Analog Headset
  - Wireless Headset
  - Bluetooth Headset
  - USB Headset
  - Using Headsets
- Bluetooth
  - Activating the Bluetooth Mode
  - Pairing and Connecting the Bluetooth Headset
  - Pairing and Connecting the Bluetooth-enabled Mobile Phone
  - Syncing the Mobile Contacts to the Phone
    - Enabling the Mobile Contacts Sync Feature
    - Viewing Your Mobile Contacts on the Phones
    - Disabling the Mobile Contacts Sync Feature
  - Viewing the Bluetooth Device Information
  - Editing Device Name of Your Phone
  - Deleting the Paired Bluetooth Device
  - Disconnecting the Bluetooth Device
  - Deactivating the Bluetooth Mode
- Wireless Network
  - Activating the Wi-Fi Mode
  - Connecting to the Wireless Network
    - Connecting to an Available Wireless Network Manually
    - Connecting to the Wireless Network Using WPS
    - Adding a Wireless Network Manually
  - Viewing the Wireless Network Information
  - Managing the Saved Wireless Network
  - Disconnecting the Wireless Network Connection
  - Deactivating the Wi-Fi Mode
- Expansion Module and Your Phone
  - Connecting the Expansion Module
  - Assigning the Features for Ext Keys
  - Adjusting the Contrast of the Expansion Module
  - Adjusting the Backlight of the Expansion Module
Maintaining Your Phone
- Warnings
  - Investigating Warnings
  - Re-provisioning Your Phone
  - Clearing Warnings
- Diagnosing the Network
- Rebooting Your Phone
- Resetting to Factory Settings
- Updating the Phone Configuration
- Clearing User's Personalized Configuration Settings
Appendix - Menu Structure
- For the T48S/T48G Phone
- For the T46S/T46G Phone
- For the T42S/T42G/T41S/T41P/T40P/T40G Phone

Yealink SIP-T42S T4 Series v4 User's Guide

Pages 122

Year 2020

Language(s)

of 122

Yealink SIP-T42S T4 Series Specification

The Yealink SIP-T42S is a feature-rich business VoIP phone designed to enhance communication efficiency and productivity in professional settings. It is part of the T4 Series, known for its robust performance and high-quality audio. The device features a 2.7-inch backlit graphical display that provides a clear and intuitive interface for users. It supports up to 12 SIP accounts, making it versatile for various business needs.

The SIP-T42S is equipped with Yealink Optima HD Voice technology and wideband codec of Opus, ensuring crystal-clear audio quality for both the speaker and microphone. It also includes features like Acoustic Shield technology to reduce background noise, enhancing voice clarity. The phone supports Gigabit Ethernet, allowing for fast and reliable network connectivity with dual-port capabilities for seamless integration with existing infrastructure.

It is compatible with a range of SIP-based IP PBX systems and supports advanced network security protocols such as TLS and SRTP for secure communications. The device offers a variety of connectivity options, including a USB port for Bluetooth, Wi-Fi, or USB recording. The phone also supports Power over Ethernet (PoE), reducing cable clutter and simplifying installation.

The Yealink SIP-T42S includes programmable keys that can be customized for various functions, enhancing operational efficiency. Its user interface is designed for ease of use, contributing to a streamlined workflow. Administrators benefit from its centralized management capabilities, allowing for easy configuration and updates. Overall, the Yealink SIP-T42S is a reliable and versatile communication tool suitable for small to medium-sized businesses seeking high performance and secure VoIP solutions.

Yealink SIP-T42S T4 Series F.A.Q.

How do I configure a SIP account on the Yealink SIP-T42S?

To configure a SIP account on the Yealink SIP-T42S, access the phone's web interface by entering the phone's IP address in a web browser. Log in with your admin credentials, go to 'Account' settings, and enter your SIP account details provided by your VoIP service provider. Save the changes to apply the configuration.

What steps should I take if the Yealink SIP-T42S is not registering with the SIP server?

Ensure that the network connection is stable and the SIP server address is correctly entered. Verify that the account credentials are accurate. Check for any firewall settings that might be blocking the connection. If issues persist, restart the phone and contact your VoIP provider.

How can I update the firmware on my Yealink SIP-T42S phone?

Download the latest firmware version from the Yealink support website. Access the phone's web interface, navigate to the 'Upgrade' section, and upload the downloaded firmware file. Follow on-screen instructions to complete the update process.

What should I do if the Yealink SIP-T42S displays 'No Service'?

Check the network connection and ensure that the Ethernet cable is securely connected. Verify that the SIP account is correctly configured and registered. Restart the phone and check for any network outages.

How can I perform a factory reset on the Yealink SIP-T42S?

To perform a factory reset, press the 'OK' button for about 10 seconds until you see the 'Reset to Factory' message. Confirm the reset by selecting 'OK' again. Alternatively, you can reset through the phone's web interface under 'Settings' -> 'Upgrade' -> 'Reset to Factory'.

How do I set up a conference call on the Yealink SIP-T42S?

During an active call, press the 'Conference' soft key. Dial the number of the third party and press 'Send'. Once the call is connected, press 'Conference' again to join all parties.

Can I customize the ringtones on the Yealink SIP-T42S?

Yes, you can customize ringtones. Access the phone's web interface, go to 'Settings' -> 'Tones', and choose from the available list of ringtones. You can also upload custom ringtones if supported.

What is the procedure to transfer a call on the Yealink SIP-T42S?

During an active call, press the 'Transfer' soft key. Enter the number you wish to transfer the call to, and press 'Transfer' again. You can choose between a blind or consultative transfer.

How do I adjust the volume on the Yealink SIP-T42S?

To adjust the call volume, press the volume up or down buttons during an active call. To adjust the ringer volume, press the volume buttons while the phone is idle.

What should I do if the Yealink SIP-T42S phone screen is frozen?

If the phone screen is frozen, try rebooting the phone by unplugging and replugging the power supply. If the problem persists, perform a factory reset or consult technical support for further assistance.