Panasonic kx-ns500 Pc Programming Manual page 866

27.3.1 Network Service—[3-1] Client Feature—FTP
Value Range
Max. 24 characters (A–Z, a–z, 0–9, =, [hyphen], [underscore])
Note
The first character must be a letter, number, or =.
Protocol
Specifies the communication protocol for the FTP connection.
Value Range
FTP, FTPS (Explicit), FTPS (Implicit)
866 PC Programming Manual