Yealink SIP-T2xP Administrator's Manual page 250

Administrator's Guide for SIP-T2xP and SIP-T19P IP Phones
The tool uses the file folder "Encrypted" as the target directory by default.
4. (Optional.) Mark the desired radio box in the AES Model field.
If you mark the Manual radio box, you can enter an AES key in the AES KEY field or
click Re-Generate to generate an AES key in the AES KEY field. The configuration
file(s) will be encrypted using the AES key in the AES KEY field.
If you mark the Auto Generate radio box, the configuration file(s) will be encrypted
using random AES key. The AES keys of configuration files are different.
Note
AES keys must be 16 characters and the supported characters contain: 0 ~ 9, A ~ Z, a ~
z.
5. Click Encrypt to encrypt the configuration file(s).
6. Click OK.
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