+ 0x00000020 SILC_CUMODE_QUIET
+
+ Marks that the client cannot talk on the channel. This
+ mode can be set by channel operator or channel founder to
+ some other user that is not operator or founder. The
+ target client MUST NOT unset this mode. When this mode
+ is set the server MUST drop messages sent by this client
+ to the channel.
+
+