Shared Line Appearance Station.
This application should be executed by an SLA station. The argument depends on how the call was initiated. If the phone was just taken off hook, then the argument station should be just the station name. If the call was initiated by pressing a line key, then the station name should be preceded by an underscore and the trunk name associated with that line button.
On exit, this application will set the variable
SLASTATION_STATUS to one of the following values:
station- Station name
This documentation was imported from Asterisk Version SVN-branch-10-r378689