Usage: CHAN <room> GREETING INSERT <number>

This command will add a line to the room's greeting message above whichever line is specified.

/as chan #conferenceroom insert 1 This is the new first line of the greeting.

This allows you to add lines in any section of the greeting so that you do not need to erase the entire greeting just to add a line above a current one. Append allows you to add a line to the end of the message.