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Cisco IPCC Express Solution Reference Network Design
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Chapter 5      Basics of Call Center Sizing
  Preliminary Information Requirements
Enhanced, but they must be sized for proper capacity planning for the IPCC Express server. For 
sizing and capacity details, refer to the IPCC Express Configuration and Ordering Tool, available 
online at 
Queue ports — are IVR ports that queue calls prior to transferring the caller to an available agent. 
These ports are included at no additional cost with IPCC Express Standard or Enhanced, but they 
must be sized for proper capacity planning for the IPCC Express server. Refer to the IPCC Express 
Configuration and Ordering Tool for more details.
IVR ports — are full-featured IVR ports with all the capabilities found in the standalone 
Cisco IP IVR product, except that the IPCC Express IVR ports do not support Intelligent Contact 
Management (ICM) integration.
CTI ports — are computer software devices used to handle telephony hardware devices such as IVR 
ports and queuing ports. CTI ports include all three types of IVR port functions for P&C, queuing, 
and IVR port options for database dips, ASR, and TTS. CTI ports are an important component in 
the IPCC Express architecture, but you do not have to purchase them separately.
If you want additional supporting features such as automatic speech recognition (ASR), text-to-speech 
(TTS), e-mail notification, web server or client functionality, and database operations, then IPCC 
Express would need additional functionality in the IP IVR to perform these operations. Because the basic 
P&C ports cannot handle additional features such as these, you would have to purchase additional IVR 
port licenses. These IVR ports, in addition to functioning as P&C ports, will also perform database dips, 
VoiceXML, ASR, TTS, web operations, and so forth.
The goal of the system architect is to determine the appropriate number and types of IVR ports to 
provision for the IPCC Express system. However, as shown in 
, the IPCC Express architecture 
differs slightly from the example TDM call center configuration in that IVR ports and queue ports (and 
P&C ports as well) are combined into one logical CTI port. Therefore, the call sizing approach in this 
document calculates trunk, IVR, and queue ports. The remaining sections of this chapter use the term 
IVR port to denote the combined queue port and IVR port (both full-service and P&C ports).
Preliminary Information Requirements
Cisco recommends that your system designers create a sizing document to do the following:
Scope out the preliminary configuration information for the IPCC Express server.
Size the gateways for the system.
To determine the size of the call center, obtain answers to the following questions:
How many IVR ports do you need?
How many gateway trunk ports do you need?
How many agents will answer incoming calls?
To answer these questions properly, you will need the sizing metrics and information listed in