2. UM Dial Plans
The UM dial plan is the basic Unified
Messaging administrative unit and used for telephony
extension-numbering. The UM dial plan, plus the extension number,
provides the unique identifier for each UM-enabled user. The UM dial
plan also controls the numbering scheme and the outbound dialing plan.
The UM dial plan is an Active
Directory container object that is a logical representation of a
Telephony dial plan that you configure on a PBX. The UM dial plan
establishes a link from an Exchange Server 2010 recipient's telephone
extension number in Active Directory to a UM-enabled mailbox.
Before you can use Unified
Messaging, your Exchange environment requires at least one UM dial plan
to be created, assigned to a UM server, and associated with a UM IP
gateway.
When you configure UM dial
plan settings, you have to define at least the extension length.
Additionally, you can configure other UM dial plan settings:
Access numbers for subscribers (OVA phone number) or your UM -enabled users dial to access their mailbox via a phone.
Default greetings that is used when subscribers call into the UM server.
Dial codes for dialing external phone numbers and international numbers.
Features such as whether subscribers can transfer callers to other users and whom callers can contact.
Time limits for calls, messages, and idle timeouts.
Default language for OVA and voice prompts.
The audio codec format for voice messages, such as MP3.
Note:
If
you want to upgrade your existing Exchange 2007 UM environment that is
connected to OCS, you need to create new UM dial plans for Exchange
2010 UM to make OCS UM-version aware. Until SP1, changing a user's dial
plan means de-provisioning and re-provisioning a user from the UM
system. SP1 changes that by enabling the Move Request to update the UM
dial plan automatically.
Exchange 2010 SP1 will
include secondary UM dial plan support, which means that you can assign
two UM dial plans to your users, especially those who use two phones
connected to different gateways.
3. UM IP Gateways
A UM IP
gateway is a logical representation of a physical IP gateway hardware
device that translates between the circuit-switched telephone network
and an IP or packet-switched network. This represents either a VoIP
gateway or an IP PBX.
The UM IP gateway
contains one or more UM hunt groups and other UM IP
gateway-configuration settings, including the actual IP gateway. The
combination of the IP gateway object and a UM hunt group establishes a
logical link between an IP gateway hardware device and a UM dial plan.
Note:
Before an IP gateway can process calls, a UM IP gateway must be associated with at least one UM dial plan.
You can create a UM IP
gateway using the Exchange Management Shell (EMS) or Exchange
Management Console (EMC). When you create a new UM IP gateway, you
enable UM servers to connect to the VoIP gateway or IP PBX. However, you can enable or disable the UM IP gateway. You can disable a UM IP gateway in two different modes:
Disable After Completing Calls Forces UM servers associated with this UM IP gateway to stop handling any new calls.
Disable Immediately Forces all associated UM servers to drop existing calls for this UM IP gateway.
4. UM Hunt Groups
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.
