So, Lets put your responses into the working methods of overflows and queuing.
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Overflow Time: Default = Blank, Range = 1 to 99999 seconds.
Calls that ring the hunt group members without being answered can be redirected to an overflow group or groups. This requires an overflow group or groups to be added to the Overflow Group List and for those groups to be In Service. The Overflow Time setting is then used to determine when the overflow groups should be used.
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If Queuing is off and all members of the hunt group are busy, a call presented to the group will overflow immediately, irrespective of the Overflow Time.
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If Queuing is on and all members of the hunt group are busy, a call presented to the group may queue for up to the Overflow Time before overflowing.
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If the call is currently ringing a hunt group member when the Overflow Time expires, it will complete ringing using the set No Answer Time before overflowing.
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If the Overflow Time is 0 or blank, a call will overflow when it has rung each available hunt group member without being answered.
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One or more calls in the group reaching their Overflow Time will permit other calls within the group to overflow if they are queued, or have rung each available hunt group member without being answered.
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When a call overflows, it is still controlled by a number of settings of the hunt group from which it has overflowed.
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Calls that overflow use the announcement settings of the original group from which they overflowed.
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Calls that overflow use the Voicemail Time of the original group from which they overflowed.
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Calls that overflow are included in the Queue Length and Calls In Queue Threshold of the hunt group from which they overflowed. They are not included in those values for the hunt group to which they overflow.
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No Answer Time (secs): Default = Blank (Use System setting). Range = 1 to 99999 seconds.
The number of seconds an extension rings before the call is passed to another extension in the list. This applies to all telephones in this group and the Overflow Groups (if used). If left blank the system Default No Answer Time (15 seconds by default) is used. For collective hunt groups the idea of moving to the next member when the No Answer Time expires does not apply. Calls will ring until the call is answered or another timeout is applied.
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Voicemail Answer Time: Default = 45 seconds, Range = Off, 1 to 99999 seconds, Software level = 4.0+.
This setting sets how long a call should be presented to a hunt group, and its overflow groups if set, before going to voicemail. When exceeded the call goes to voicemail (if available) regardless of any announcements, overflow, queuing or any other actions.
ACA - IP Office Implement
ACA - IP Telephony
CCENT - Cisco ICND1
CCNA - Working towards.