A UM hunt group is a logical representation of an existing PBX or IP PBX hunt group. When the hunt group's pilot number receives a call, the PBX or IP PBX looks for the next available extension number to deliver the call. When the call's recipient does not answer an incoming call, or the line is busy because the recipient is on another call, the PBX or IP PBX routes the call to the UM server.
UM hunt groups act as a link between UM IP gateways and UM dial plans. Therefore, you must associate a UM hunt group with at least one UM IP gateway and one UM dial plan. UM hunt groups locate the PBX hunt group from which the incoming call was received. A pilot number that is specified for a hunt group in the PBX also must be specified within the UM hunt group. The pilot number enables the UM server to associate the call with the correct UM dial plan so that it can route the call correctly.
When you create a new UM hunt group, you enable UM servers in the specific UM dial plan to communicate with the UM IP gateway. You need to specify the UM dial plan and the pilot identifier or pilot number that you want it to use with the new UM hunt group.
| Note | You can create UM hunt groups only if you have already created a UM IP gateway. |
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