Atlas VoiceOne Documentation
  • About
  •  User Guide
    • Feature Codes
    •  Handset Guides
      • Information About Handsets
      •  Grandstream
        • Quick Reference
        • GXP1628
        • GXP1630
        • GXP2130
        • GXP2160
        • DP715
        • DP715 Quick Reference
      •  Yealink
        • Quick Reference
        • Model Comparison
        • T21P
        • T27P or T27G
        • T53
        • T54w
        • W52P Quick Reference
  •  Admin Guide
    • Getting Started
    • Network Configuration
    •  Web Interface
      • Logging In
      • Dashboard
      •  Home
        • Account Settings
        • Dashboard
        • Logout
      •  Accounts
        • Devices
        • Extensions
        • Users
      •  Dialplan
        • Destinations
      •  Apps
        • Call Block
        • Call Detail Records
        • Call Flows
        • Call Routing
        • Contacts
        • Fax Servers
        • IVR Menus
        • Music on Hold
        • Operator Panel
        • Recordings
        • Ring Groups
        • Time Conditions
        • Voicemail
      • Logout
    •  Autoprovisioning
      • Autoprovisioning
      • Grandstream
      • Yealink
  •  Troubleshooting
    • Intermittent Response
    • Poor Audio
    •  SIP ALG
      • Disable SIP ALG on Cisco IOS
      • Disable SIP ALG on Juniper JunOS
      • Disable SIP ALG on Sky Hub
      • Disable SIP ALG on TP-Link W9970
  •  Knowledgebase
    • Distinctive Ringing
    • Emergency Calls
    • Grandstream - Connection Failed
    • Stored Information
  • Technical Support

User Guide Handset Guides Yealink T21P

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