Yealink Yealink SIP-T28P, User Manual

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Troubleshooting
25
Troubleshooting
This chapter provides general troubleshooting information to help you solve the problems
you might encounter when deploying the phones.
If you require additional information or assistance with the deployment, contact your
system administrator.
Why does the phone fail to download the configuration file?
!
Ensure that the Auto Provisioning feature is enabled.
!
Check that the provisioning server or the network is reachable.
!
Check that authentication credentials configured on the phone are correct.
!
Ensure that the configuration file exists on the provisioning server.
Why does the provisioning server return a HTTP 404?
!
Check that the provisioning server is properly set up.
!
Revisit the path configuration (URL rewriting, port).
!
Ensure that the requested file exists on the provisioning server.
Why does the phone display "Network Unavailable"?
!
Ensure that the Ethernet cable is plugged into the Internet port o the phone and the
Ethernet cable is not loose.
!
Ensure that the switch or hub in your network is operational.
!
Check the configuration of network is properly set in the configuration files.
!
Contact your system administrator for more information.
Why does the permission denied when uploading files to a FTP server?
!
Ensure that the root directory of the FTP server contains the full directory path.
!
On the provisioning server, check the file permissions, if necessary, change the file
permission.
!
Contact your system administrator for more information.
Why does not the phone obtain the IP address from DHCP server?
!
Ensure that your settings are right on the DHCP Server.
!
Ensure your phone is configured to obtain the IP address via DHCP server.
!
Contact your system administrator for more information.