1) Welcome to the party!
2) Always post your Vicidial Version with Build (Goautodial is the Installer, helpful to know, as well, good to post it).
3) This is a support question not directly related to the installer, so I'll move it to the Support board where it will have a larger audience and a better likelihood of getting appropriate responses. The GoAutoDial board is more for items specifically related to installation with that .iso or CentOS or GoAutoDial special interface problems.
4) When modifying the InGroup:
Drop Call Seconds - The number of seconds a call will stay in queue before being considered a DROP.
Drop Action - This menu allows you to choose what happens to a call when it has been waiting for longer than what is set in the Drop Call Seconds field. HANGUP will simply hang up the call, MESSAGE will send the call the Drop Exten that you have defined below, VOICEMAIL will send the call to the voicemail box that you have defined below and IN_GROUP will send the call to the Inbound Group that is defined below.
Drop Exten - If Drop Action is set to MESSAGE, this is the dial plan extension that the call will be sent to if it reaches Drop Call Seconds. For AGENTDIRECT in-groups, if the user is unavailable, you can put AGENTEXT in this field and the system will look up the user custom five field and send the call to that dialplan number.
Voicemail - If Drop Action is set to VOICEMAIL, the call DROP would instead be directed to this voicemail box to hear and leave a message. In an AGENTDIRECT in-group, setting this to AGENTVMAIL will select the User voicemail ID to use.
To create a "message" you dial 8167 (password 4321) and record a message. The script will give you a number that you can place in the "Drop Exten" field. Then you set Drop Action to Message and when a call drops it will play the message and terminate the call after.