i Set/unset channel as invite only channel
t Set/unset that only channel operator or
founder may set channel topic
+ m Set/unset user silencing. Normal users
+ are not able to talk on channel. Only
+ channel founder may set this mode
+ M Set/unset operator silencing. Operators
+ are not able to talk on channel. Only
+ channel founder may set this mode
l <limit> Set/unset channel's user limit
a <passphrase> Set/unset passphrase for channel that must
be provided when joining to the channel.