Yealink SIP-T4X Administrator's Manual page 235

using random AES key. The AES keys of configuration files are different.
AES keys must be 16 characters and the supported characters contain: 0 ~ 9, A ~ Z, a ~
Note
z.
5. Click Encrypt to encrypt the configuration file(s).
6. Click OK.
The target directory will be automatically opened. You can find the encrypted
configuration file(s), encrypted key file(s) and an Aeskey.txt file storing plaintext AES
key(s).
Procedure
Encryption method and AES keys can be configured using the configuration files or
locally.
Configuration File <y0000000000xx>.cfg
Configuring Security Features
Configure the decryption
method and AES keys.
For more information, refer to
Configuring Decryption Method
219