Get or set a feature option on a channel.
When this function is used as a read, it will get the current value of the specified feature option for this channel. It will be the value of this option configured in features.conf if a channel specific value has not been set. This function can also be used to set a channel specific value for the supported feature options.
option_name- The allowed values are:
parkingtime- Specified in seconds.
This documentation was imported from Asterisk Version SVN-branch-11-r379343