Call Distribution Components

Line groups, hunt lists, and hunt pilots work together to provide call-distribution capabilities in Cisco CallManager Administration. Call distribution is the ability of a caller to dial a number and have the call extended in an ordered manner to members of a group. An example of this functionality is a company 800 number to reach a company technical support department.

A line group contains directory numbers (DNs) and designates the order in which DNs are chosen.

A hunt list contains one or more prioritized line groups.

A hunt pilot is a number that is associated with a hunt list. The hunt pilot can be called directly (for example, to a technical support hotline for a company), or can be reached through forwarding (for example, a caller places a direct call to a technical support group member, and if that member is not available, the call is forwarded to the hunt pilot number). Figure 12-1 demonstrates the proper design of the Cisco CallManager call distribution components.

Figure 12-1. Cisco CallManager Call Distribution Components

 

Line Groups

A line group allows you to designate the distribution mechanism where DNs are chosen.

Line groups contain the following components, shown in Figure 12-2:

Figure 12-2. Line Group Components

Cisco CallManager distributes a call to idle or available members of a line group based on the call-distribution algorithm and on the RNAR setting.

Call-Distribution Algorithms

Line groups contain an algorithm that controls how calls that come in on the hunt pilot are distributed to members, as follows:

Hunt Options

Hunt options configured in the line group apply to members in one of the three states: no answer, busy, or not available. Not available is a state triggered by the Do Not Disturb (DND) line state, covered later in the chapter. For a given distribution algorithm, the hunt option specifies where CallManager should distribute a call next if a member of a line group is busy, does not answer, or is not available. The Line Group Configuration window provides the following options for each of the three hunt options:

Tip

Distributing the call to other line groups can be useful in an environment where you have Tier 1 and Tier 2 tech support. If all the lines in Tier 1 are busy, the call can spill over to the Tier 2 group. In addition, the Tier 2 employees will see the call redirect information so they can answer the call appropriately.

 

Call Distribution Scenarios: Top-Down Example

Figure 12-4 shows an example of a line group (Line Group 1) with the following setup information:

Figure 12-4. Call Distribution Example

The call flow is as follows:

  1. Caller calls hunt pilot 1-800-555-0155.
  2. 1000 rings and is not answered for 10 seconds (RNAR timeout).
  3. The call extends next to 1001, following the top-down algorithm and RNAR setting.
  4. 1001 rings for 3 seconds.
  5. 1001 is answered.

Hunting and Forwarding

Hunting differs from call forwarding, although both allow calls to be redirected. Hunting allows Cisco CallManager to extend a call to one or more lists of numbers, where each such list can specify a hunting order that is chosen from a configurable set of algorithms. When a call extends to a hunt party from these lists and the party fails to answer or is busy, hunting resumes with the next hunt party. (The next hunt party varies depending on the current hunt algorithm.) Hunting thus ignores the Call Forward No Answer (CFNA) or Call Forward Busy (CFB) settings for the attempted party.

Call forwarding allows detailed control as to how to extend (divert and redirect are equivalent terms for extend) a call when a called party fails to answer or is busy and hunting is not taking place. For example, if the CFNA setting for a line is set to a hunt pilot number, an unanswered call to that line diverts to the hunt pilot number and thus begins a hunt.

Starting with Cisco CallManager Release 4.1, Cisco CallManager offers the ability to redirect a call when hunting fails (that is, when hunting terminates without any hunt party answering, either because the list of hunt numbers exhausts or because the hunt process times out). If used, this final redirection constitutes a Call Forwarding action. Therefore, the Hunt Pilot Configuration window in Cisco CallManager Administration (choose Route Plan > Route/Hunt > Hunt Pilot) includes call forwarding configuration concepts that are similar to those found in the Directory Number Configuration window (Forward No Answer/Forward Busy).

In Cisco CallManager Release 4.0, hunting stops either when one of the hunt parties answers the call or when the hunt list is exhausted. When hunting stops due to exhaustion, the caller receives a reorder tone (or an equivalent announcement).

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