3Com VCX V7000 Manager's Manual page 77

Note that a member must be logged in to both the VCX system and the
hunt group to receive a call.
Linear Hunt Group — An incoming call always rings at the first
member phone of the group, then, if the call is not answered, at the
phone of the next member in the group list.
For example, if A, B, C, and D are all available, an incoming call will
always ring first at member A's extension. If A does not answer, the
call is routed to member B's extension, and so on until the last
member of the group is reached. If no member is available, the call is
routed to the call coverage point immediately. When the total timeout
value configured for the group is reached or the last hunt group
member fails to answer (whichever happens first), the call is routed to
the call coverage point (see the discussion of timeout values and call
coverage points later in this section).
Circular Hunt Group — An incoming call rings at the member phone
following the member to whom the last call was routed. If the call is
not answered, the call rings at the phone of the next member in the
group list.
For example, if A, B, C, and D are all available and member B received
that last call, the next call will ring at member C's extension. If C does
not answer, the call is routed to member D's extension, and so on until
the total timeout value for the group is reached (see the discussion of
timeout values later in this section).
Calling Group — An incoming call simultaneously rings on all
member phones that are logged in, even if a member is on another
call.
For example, if A, B, C, and D are all available, an incoming call will
ring simultaneously at all four extensions until the total timeout value
for the group is reached (see the discussion of timeout values later in
this section).
For each hunt group type, your administrator configures two timeout
values:
Device Timeout — Specifies how long the VCX call processor rings at
one extension before moving to the next extension if there is no
answer.
Total Timeout — Specifies how long the VCX call processor attempts
to make a connection within the hunt group before directing the call
Hunt Groups 77