Information Technology Reference
In-Depth Information
It is important to remember, however, that the success or failure of the attempt to turn on/off the MWIs is determined by many
factors, including the correct configuration of MWI directory numbers (DN) on Unity and CUCM (they must match) and the correct
configuration of calling search spaces and partitions. In particular, the Unity voicemail ports must have a calling search space that
allows them to dial the partition containing the MWI DNs, the MWI DNs must have appropriate calling search spaces (used to call
subscriber phones), and if overlap in user DNs does exist, partitions must be appropriately ordered in the calling search space.
Another issue that can occur is that MWIs might not turn off when they should. In this case, the solution can be to resynchronize
MWIs under the CUCM integration properties in UTIM.
Other issues that can affect MWI include the failure to otherwise properly configure voicemail ports correctly on either Unity or
CUCM.
SIP
Unity also can be configured to integrate with a SIP phone system via the UTIM and the Telephony Integration Setup Wizard.
As the name suggests, SIP integrations are reliant on SIP for communication (rather than SCCP, which is used for communication in a
CUCM/Unity integration). Note, however, that SIP integration is reliant on a SIP proxy server and a SIP gateway.
In UTIM, you must configure the parameters such as integration and cluster names, IP addresses of SIP proxy servers, the number
of voice messaging ports that will be used, the contact line number that Unity will register with the SIP proxy, the TCP port for SIP
communications, a preferred codec, SIP authentication name and password (if required), and port settings.
When a proxy server forwards calls to Unity, it includes the following information (in the SIP message):
■
The called party extension included in the Diversion header
■
The reason why the call was forwarded in the Diversion header
■
The extension of the calling party (internal calls) or SIP URL of the calling party (external calls with caller ID) in the From
header
Unity answers and routes calls on the basis of this information.
