Cisco Voice Gateways and Gatekeepers by David Mallory, Ken Salhoff, Visit Amazon's Denise Donohue

By David Mallory, Ken Salhoff, Visit Amazon's Denise Donohue Page, search results, Learn about Author Central, Denise Donohue,

Cisco Voice Gateways and Gatekeepers offers precise strategies to real-world difficulties encountered while enforcing a VoIP community. every one bankruptcy offers an outline of a expertise through a close situation and linked options. Emphasis is put on the authorized most sensible practices and customary matters encountered. it is going to at the beginning serve readers as a reference for advanced gateway and gatekeeper deployments and also will be a invaluable research reduction for the Cisco Certifified Voice expert (CCVP) certification music. Cisco Voice Gateways and Gatekeepers is split into 5 sections. half one offers an creation to the jobs of either gateways and gatekeepers and comprises recommendation on while to exploit every one. half specializes in deploying gateways; operating with MGCP, H.323, and SIP; connecting to the PSTN, PBXs, and the IP WAN; configuring uncomplicated and complicated dial friends; and imposing SRST. half 3 specializes in deploying and configuring gatekeepers. half 4 discusses use of gateways and gatekeepers in a merchant setting. half 5 addresses use of the Cisco instrument Command Language (TCL). This ebook is additionally prompt self-study education for the CCVP GWGK examination.

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The necessary configuration depends on the type of endpoint. Configure the directory number for FXS ports here, rather than on the router. Figure 2-8. Configuring MGCP Endpoints [View full size image] Step 7. The next step is to reset the gateway, as shown in Figure 2-9. Note that resetting an MGCP gateway drops any calls that are using that gateway. Figure 2-9. Resetting the Gateway [View full size image] 52 Part II: Gateways Part II: Gateways Step 8. 53 To verify that the gateway is registered, go back to the Find and List Gateways screen.

The CallManager responds with an RQNT message per endpoint, listing the events it wants to be notified of. 6. The gateway acknowledges those messages. The gateway, along with its endpoints, is then registered with the CallManager. Call Flow with MGCP MGCP uses the messages described in the previous section during call setup and teardown. The exact procedure varies depending on the type of endpoint, but completing an MGCP phone call involves four basic steps: 1. When CallManager is notified of a phone going off-hook, it asks the calling gateway to create a connection on that endpoint.

CallManager asks the receiving gateway to create a connection on one of its endpoints. The message includes the SDP information from the calling gateway. The receiving gateway creates a connection and responds with its own SDP message. 3. CallManager sends the session description information for the receiving gateway to the calling gateway with a modify connection message. Communication is now bidirectional, and the call can proceed. 4. When one endpoint hangs up, CallManager sends a DLCX to both gateways, and the call ends.

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