Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones 
952 
Encrypting and Decrypting Files 
Yealink IP phones support downloading encrypted files from the server and encrypting files 
before/when uploading them to the server. You can encrypt the following files: 
  Configuration files: MAC-Oriented CFG file (<MAC>.cfg), Common CFG file 
(y0000000000xx.cfg), MAC-local CFG file (<MAC>-local.cfg) or other custom CFG files 
(e.g., sip.cfg, account.cfg) 
  Contact Files: <MAC>-contact.xml 
To encrypt/decrypt files, you may have to configure an AES key. 
Configuration Parameters 
Procedure 
Configuration changes can be performed using the following methods. 
Configure whether to only download and 
resolve the encrypted files. 
Parameter: 
static.auto_provision.update_file_mode 
Specify if the contact file is encrypted when it is 
uploaded from the phone to the server. 
Parameter: 
static.auto_provision.encryption.directory 
Specify if the MAC-local CFG file is encrypted 
when it is uploaded from the phone to the 
server. 
Parameter: 
static.auto_provision.encryption.config