Aastra 9143i Series Administrator's Manual page 909

Operational, Basic, and Advanced Parameters
Example The following example downloads no private key file:
sips private key:
The following example downloads the private key file from the original
configuration server.
sips private key: phonesPrivateKey.pem
The following example uses FTP to download the firmware file
"phonesPrivateKey.pem" (private key file) from the "path" directory on
server 1.2.3.4 using port 50:
sips private key: ftp://admin:admin!@1.2.3.4:50/path/
phonesPrivateKey.pem
41-001160-04 Rev 02, Release 2.5 A-123