There are 20 ring groups and they can all be used in any order (groups 11 to 20 are slightly different to the other groups, this will be explained later).
The groups allow you to organise your extensions e.g. the extensions you want to ring when someone calls you can all be put into a group and the system can be programmed to ring this group when someone calls.
The number of extensions programmed in each group can be from a single extension up to 16 extensions.
In default (default is the programming on the system when it is delivered from the factory) group 1 is programmed with extensions 20 to 27 (that's 8 extensions) and all the other groups are programmed with extension 20 only (yes, extensions can be programmed in more than one group).
All groups must be programmed with at least one extension. The default ringing setting is for all lines to ring group 1 when someone calls you, so extensions 20 through to 27 will all ring if they are free.
Each group is given a number on the system (similar to how each extension is given a number), group 1 is 180, group 2 is 181 and so on until group 20 is 199.
So, on a defaulted system if an extension dials 180, extensions 20 through to 27 will ring if they are free. If an extension dials 194, extensions in group 13 will ring if they are free (in default this would be extension 20 only).
DDI numbers can be programmed to ring a group. The group can be set up with the extension(s) you want to ring when someone calls the DDI number.
If a group has a mailbox enabled, extensions in the group can divert calls for the group using the Group divert feature to the mailbox (divert all calls, divert on busy and divert on no reply). The mailbox number for the group is the same as the group number (180 to 199).
As well as being ring groups (when called all the free extensions in the group ring) groups can be designated as hunt groups. There are three different kinds of hunt group, linear hunt group, cyclic hunt group and longest idle hunt group. Once a group has been designated as a hunt group extensions in the group must log into the group.
Groups are also used to organise extensions in pickup groups.
If group 5 is programmed with extensions 24 and 27 and line 2 is programmed to ring group 5, when someone calls line 2 extensions 24 and 27 will ring if they are free.
In the same office extension 31 has a desk and he wants to be able to answer this call without having to cross the office to answer the call.
To do this create another group with extensions 24, 27 and 31 in it (this can be any other group that has not been programmed as the ringing point for a line or a DDI number).
Now when someone rings line 2 extensions 24 and 27 will ring if they are free but extension 31 will be able to answer the call by selecting call pickup or dialling the pickup code.
As mentioned previously groups 11 to 20 have an additional feature. These are used to allow single digit dial though of auto attendant.
See page 53 to 56 of the attachment below for full details
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