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

Cisco Voice Gateways and Gatekeepers presents specific strategies to real-world difficulties encountered whilst imposing a VoIP community. every one bankruptcy offers an outline of a expertise through a close situation and linked options. Emphasis is put on the permitted most sensible practices and customary matters encountered. it's going to first and foremost serve readers as a reference for complicated gateway and gatekeeper deployments and also will be a helpful examine reduction for the Cisco Certifified Voice specialist (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 contains recommendation on while to exploit each one. half specializes in deploying gateways; operating with MGCP, H.323, and SIP; connecting to the PSTN, PBXs, and the IP WAN; configuring simple and complicated dial friends; and enforcing SRST. half 3 makes a speciality of deploying and configuring gatekeepers. half 4 discusses use of gateways and gatekeepers in a merchant setting. half 5 addresses use of the Cisco device Command Language (TCL). This e-book is usually urged self-study education for the CCVP GWGK examination.

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Connections have properties, such as codec, IP address, port number, bandwidth, and encryption. MGCP uses the Session Description Protocol (or SDP, defined in RFC 2327) to inform CallManager about these details of the connection. Endpoints generate events, such as when a phone on an FXS port goes off-hook or dials digits. Cisco CallManager can ask to be notified when it receives specific events on its gateways. The CallManager can then instruct the gateway to send signals, such as dial tone or ringing.

You must choose a CallManager group to use, even if it is just the default one. Figure 2-7. CallManager Gateway Configuration [View full size image] Step 5. On the same screen, begin configuring the endpoints. The available router slots are listed, as is a drop-down menu to select the type of voice module they contain, if any. ISR routers contain four WIC/VWIC slots that are not part of a separate module. " Be sure to choose this option, as shown in the example, if you intend to use these slots.

The CallManager can learn the parameters that are associated with a connection by using the AuditConnection (AUCX) command. The EndpointConfiguration (EPCF) command instructs the gateway about configuration to be applied to the endpoint. The gateway initiates a RestartInProgress (RSIP) message to the CallManager when an endpoint or group of endpoints are going out of or coming into service, or when the gateway will restart. Three types of restarts exist: • Graceful The restart is delayed to allow any existing connections to finish their calls.

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