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What is a calling search space

Unified messaging systems do not understand calling search spaces and partitions, so CallManager must maintain a calling search space on behalf of the unified messaging system to properly route the message waiting indication. Furthermore, when CallManager has overlapping extensions, as in the case of multitenant installations, it is sometimes necessary to perform number translation to ensure both that messages from two different users do not end up in the same voice mailbox, and that CallManager delivers message waiting notifications to the correct users.

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SMDI is a standard protocol specifically designed to permit different telephone systems to integrate with voice mail systems. It uses an RS interface between a telephone system and a voice mail system to communicate information between the systems.

Partition and Calling Search Space عربى

CallManager connects to voice messaging systems with the help of the CMI service. When CallManager offers a call to the gateway to the voice mail system, CMI sends an SMDI message to the voice mail system that tells the voice mail system to associate the incoming call with a particular voice messaging box. When the calling user leaves a voice message, the voice mail system, in turn, sends an SMDI message to CMI, which tells CallManager to set the message waiting indicator on the appropriate phone.

CMI has several service parameters that must be set properly in order to function. CallManager user documentation describes these parameters, but Table summarizes the ones that are inextricably intertwined with CallManager call routing settings. The calling search space that CMI should use when telling CallManager to set a phone's message waiting indicator. Rather, when CallManager offers a call to these systems, the call setup message directly provides them with the information that they need to deliver the voice message.

When non-RSbased voice messaging systems need to set a message waiting indicator for a particular phone, they do it in a rather unusual manner. When a voice messaging system needs to set a message waiting indicator, it calls either the message waiting on or message waiting off directory number and provides the directory number of the phone whose message waiting indicator should change as the calling number. Message waiting numbers are patterns like other dialable addresses and thus belong in partitions. When configuring a message waiting number, the calling search space of the calling voice mail system needs to contain the partition of the message waiting on or message waiting off number.

Message waiting numbers have their own search spaces. CallManager uses the calling search space that you associate with the message waiting numbers to locate the Cisco IP Phones for which you want to leave a message waiting indicator; therefore, the calling search space for the message waiting number should contain the partition of your IP Phones or of a translation pattern that selects your IP Phonessee the section "Message Waiting Indicator".

CallManager service parameters control several settings related to voice messaging.

Understanding Calling Search Space Usage at the Phone and Line Level | Global Knowledge

Table lists these settings. When set to True, this setting permits you to use translation patterns to convert voice messaging box numbers back into directory numbers when a voice mail system issues a command to set a message waiting indicator. It defaults to False. The section "Message waiting Indicator" explains this function in more detail. You can mix and match the communication methods between CallManager and your unified messaging system.

For instance, you can run CMI for purposes of delivering the voice message box to the unified messaging system, but have the unified messaging system call CallManager's message waiting numbers to set a phone's message waiting indicator. Although in normal cases you would not mix these methods of integration with voice mail, depending on your unified messaging system, mixing these methods might be the only way you can both leave messages in the appropriate mailboxes and receive message waiting indications.

In CallManager 4. The voice mail pilot can represent a variety of destinations. For instance, with QSIG-based voice mail, the pilot number can represent but a single gateway. With SCCP-based voice mail systems such as Cisco Unity, this pilot number can represent a hunt list containing the individual Unity voice mail ports.

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With legacy voice mail systems connected via Cisco MGCP gateways, this pilot number can point to a route list that selects one or more MGCP gateways that connect to the voice mail system. When you configure a voice mail pilot, you are not actually defining the routing construct needed to route the call to the actual voice mail system.

For example, if you have Cisco Unity voice mail, you must still configure a hunt list containing individual voice mail ports. Instead, consider the voice mail pilot as a call forwarding destination; when CallManager determines that the call must go to voice mail, it directs the call to the number you configure using the associated calling search space. For the call to be processed properly, you must configure the destination a hunt pilot or route pattern that will handle the call. In fact, the voice mail pilot is very much like a forwarding destination.

CUCM: Understanding Partition and Calling Search Space (CSS)

Instead, the destination is the voice mail pilot and voice mail calling search space you configure in the voice mail profile assigned to the line. CallManager also uses the voice mail pilot as the target called when IP Phone users press their messages button. Voice Mail Check Box You can always manually configure the forwarding calling search spaces and specify the actual address of the voice mail system directly on the Directory Number Configuration page, but using the voice mail profile is better, especially if you have multiple voice mail systems connected to CallManager.

Instead, CallManager uses as the call forward destination the voice mail pilot that you have configured in the voice mail profile associated with the forwarded directory number. Instead of using the call forwarding calling search spaces you configure on the Directory Number Configuration page, CallManager uses the calling search space you've associated with the selected voice mail pilot. So why not just manually configure the voice mail pilot number directly on the Directory Number Configuration page?

If you have but a single voice mail system attached to CallManager, this option is a viable one. However, CallManager can simultaneously support more than a single voice mail system. When more than one voice mail system is in use, it might happen that the voice mail boxes of the IP Phones connected to CallManager are hosted on one system, while other IP Phones have their voice mailboxes on another system. It might also happen that an IP Phone associated with one voice mail system sets its call forward all setting to an IP phone whose mailbox resides on another system.

When you check the Voice Mail check box on the Directory Number Configuration page, you inform CallManager that the configured forward destination is intended to be voice mail. Because the caller presumably wants to leave voice mail for the party that she dialed instead of the call forwarding target, CallManager strives to communicate to voice mail systems the identity and voice mailbox of the originally called party. If the forward target diverts the call to its voice mail pilot and CallManager communicates the voice mailbox of the original target of the call, at best, the voice mail system will be unable to find the voice mailbox of the original target and, at worst, the caller will leave a voice message in the voice mailbox of a completely unrelated party.

By checking the Voice Mail check box, you allow CallManager instead to divert the call to the voice mail system associated with the original target of the call. When CallManager then communicates the voice mailbox number of the original target, the voice mail system that receives the call can store the recorded message for the proper party. Not all unified messaging systems handle the voice message box number. The following list describes how CallManager manages the voice message box for different types of unified messaging systems:.

Incidentally, CallManager sets up the redirecting number information element for calls across digital gateways using the same logic. If you connect CallManager to another telephone system with a digital interface, and the other system manages the unified messaging for your enterprise, this behavior can affect the voice message box that the unified messaging receives. For instance, if phone calls phone controlled by CallManager, and CallManager subsequently forwards the call to the unified messaging system on the other telephone system, the redirecting number information element tells the other system that the call has previously been forwarded so that the voice messaging system can deliver any voice message to the correct voice message box.

For the redirecting number, CallManager uses the voice messaging box you have configured for phone , or if you have not configured a voice message box. If you have not configured any voice mailbox for the forwarded phone, CallManager instead communicates the directory number of the forwarded phone. Voice mail profiles allow you to deal with multiple-tenant configurations, because voice messaging systems do not understand calling search spaces or partitions.


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Without the voice message box information, CallManager can provide only the directory number of a called phone to a voice messaging system. In a multiple-tenant configuration, two users may have the same directory number. CallManager does not provide partition information to voice messaging systems, so how can these systems decide which voice message box to deliver the voice mail message to?

They cannot. Therefore, by providing voice mail profiles, CallManager permits you to map duplicate directory numbers to unique ones for example, the external numbers by which users in the PSTN call your enterprise. When a message is left for a user in a voice messaging system, the system tells CallManager to turn on the message waiting indicator for the user by one of the following methods:.

CallManager uses the number that the voice message box provides and the calling search space parameter associated with the voice mail system to locate the phone whose message waiting indicator must be changed. For the message waiting on and off numbers, configuration requires two steps.

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CUCM Partitions and Calling Search Spaces

On the voice mail port that you have configured to handle the message waiting indicator command from the voice mail system, you must configure a calling search space that contains the partition that contains the Message Waiting On and Message Waiting Off numbers. Upon receiving the command to light or extinguish the message waiting lamp, the Message Waiting feature needs to locate the directory number whose lamp needs to be lit or extinguished.

The calling search space CallManager uses for this lookup is the calling search space you configure under the Message Waiting Configuration page.


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When the voice message box and directory number are the same, this lookup locates the number of the appropriate phone. But when the voice message boxes and the directory numbers of your phones differ, as is usually the case in multitenant installations, you must use translation patterns to direct the message waiting indicator to the correct phone.


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Figure shows the behavior that occurs when a voice messaging system attempts to set the message waiting indicator for the phone with voice message box It depicts a scenario that uses the message waiting on number. The same configuration works for the SMDI method of setting the message waiting indicator.