Cisco.IP.Telephony.Planning.Design.Implementation.Operation.and.Optimization [Electronic resources] نسخه متنی

Perform Implementation Readiness Analysis

The second major task in implementation is to perform readiness analysis, which includes the following checks:

Site readiness

Voice network readiness

Data network readiness

IPT readiness

Appendix H contains the checklists of the steps that the deployment team needs to perform to complete the implementation readiness analysis.

Site Readiness

Appendix H covers the following tasks:

Determine IPT/network component placement.

Evaluate rack space and cabling requirements.

Evaluate power and HVAC requirements.

The deployment team needs to review each of these readiness checklists and tighten up the loose ends where needed. You might have covered some of these tasks in the planning phase of the IPT network. The checks are included here to ensure that the steps recommended in the planning phase have been implemented and the basic infrastructure is ready to employ IP Telephony.

You should check the power requirements before deploying the IPT network, especially when you are using inline power features to provide the power to IP Phones. Based on the IP Phone model, quantity, and placement, the capacity of power supplies required at the LAN switches varies. In addition, each device in the network has a different power requirement. For instance, the power requirement of Catalyst switches varies depending on the model number and type of line cards used. Therefore, when evaluating the additional power requirements for IPT solutions, include all of these devices in your calculations. Use the IPT power calculator that is available on Cisco.com to calculate the power supply requirements for the switches:

http://www.cisco.com/go/powercalculator

An uninterrupted power backup system ensures high availability of the IPT network. Analyze the HVAC requirements for the additional IPT network components that are going to be deployed in the server/data centers. Confirm with facility management that the building where the IPT equipment will be installed has enough air conditioning capacity to meet the IPT equipment cooling requirements.

Voice Network Readiness

Assessing the voice network consists of examining the legacy PBX, voice-mail system, ACD systems, voice circuits, extension numbers, dial plan, and various call features. To successfully integrate the legacy equipment with the IPT network, you might need to purchase additional hardware or software licenses for the legacy equipment. The readiness process ensures that you are equipped with all such interfacing equipment before you move the users from the legacy system to the new-world IPT system. You can identify these types of special requirements during the planning phase of the IPT project, as discussed in Chapter 4, "Planning Phase," and with the help of the questionnaires in Appendix B, "IPT Planning Phase: Network Infrastructure Analysis Questionnaire," and Appendix C, "IPT Planning Phase: Telecom Infrastructure Analysis Questionnaire."

Data Network Readiness

Chapters 4 and 5, "Design Phase: Network Infrastructure Design," such as configuring the switch ports where IP Phones, gateways, and IPT servers terminate, and configuring the quality of service (QoS) on WAN links. The data network readiness includes analysis of the LAN/WAN infrastructure readiness to ensure that all the prerequisite changes are implemented.

IP Telephony Readiness

The IPT readiness check verifies that the design is completed for the call-processing servers (such as the CallManager server), the voice-mail system, IPT applications, and all the devices supporting the IPT network. Directly diving into the implementation phase without completing the proper design introduces delays and might prevent you from meeting all the requirements of the new IPT system.

During the design phase of the IPT solution, you should select the equipment and CallManager software version that you need in the network, depending on the features required. Before you deploy the IPT solution, to ensure interoperability, you need to consider the software versions for the other applications, such as Unity and IPCC Express, that need to interact with CallManager and the software versions on the voice gateways.

Refer to the Cisco CallManager Compatibility Matrix on Cisco.com before you make a decision regarding the software versions for the other applications:

http://www.cisco.com/univercd/cc/td/doc/product/voice/c_callmg/ccmcomp