Case Study: Your Turn to Be Trilingual
Case Study: Your Turn to Be Trilingual
The case study in Chapter 4, "Meet the 'Brain' of the Voice over IP Network," directed you to design an IP telephony solution for the XYZ Company. Your
Realize that your selection of a gateway protocol might
Identify your gateway protocol recommendation for the XYZ Company (that is, H.323 , MGCP , or SIP ), and discuss the rationale for your selection in the following section. Design Description for XYZ Company:____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ Suggested SolutionChapter 4's suggested solution used a distributed deployment model, with CCM clusters located at XYZ Headquarters and XYZ Remote Office 1. Also, XYZ Remote Office 2 contained a CallManager Express (CME) router, as shown in Figure 5-8. Figure 5-8. Chapter 4's Suggested Solution
Because the suggested solution only contained Cisco call processing equipment (that is, the design did not use any third-party hardware) and because a distributed deployment model and a CME router were used, the suggested gateway protocol is H.323 . However, if XYZ Company used a centralized deployment model (that is, where all CCM servers reside at XYZ Headquarters), MGCP might be an appropriate gateway protocol choice. MGCP lends itself well to a centralized environment because the MGCP model specifies a centralized call agent with which remote MGCP gateways register. SIP is often used in a CCM environment when connecting a CallManager cluster to a third-party SIP solution. 
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Chapter SummaryThis chapter discussed the need for gateway control protocols. For example, when an IP phone on an IP telephony network needs a connection with a phone on the PSTN, the phone call traverses a gateway. The gateway and the CCM server need a common language (that is, protocol) for communication. Three gateway control protocols include H.323, MGCP, and SIP. H.323 represents the most mature of the gateway control protocols and is appropriate for a distributed deployment environment.
MGCP uses a call agent (for example, a CCM server) to store call-forwarding intelligence, while H.323 stores
SIP represents a
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