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 specific suggestions to real-world difficulties encountered while imposing a VoIP community. every one bankruptcy offers an outline of a expertise through a close state of affairs and linked recommendations. Emphasis is put on the accredited most sensible practices and customary concerns encountered. it is going to at first serve readers as a reference for complicated gateway and gatekeeper deployments and also will be a important examine reduction for the Cisco Certifified Voice expert (CCVP) certification song. Cisco Voice Gateways and Gatekeepers is split into 5 sections. half one presents an creation to the jobs of either gateways and gatekeepers and contains suggestion on while to take advantage of each one. half specializes in deploying gateways; operating with MGCP, H.323, and SIP; connecting to the PSTN, PBXs, and the IP WAN; configuring easy and complicated dial friends; and imposing SRST. half 3 makes a speciality of deploying and configuring gatekeepers. half 4 discusses use of gateways and gatekeepers in a merchant atmosphere. half 5 addresses use of the Cisco software Command Language (TCL).
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Extra resources for Cisco Voice Gateways and Gatekeepers
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.
For instance, if the gateway sets up the connection for a voice call and then notices fax tones, CallManager changes the encoding. The CallManager changes these parameters with a ModifyConnection (MDCX) command containing the new connection settings. To terminate a connection, the CallManager sends the gateway a DeleteConnection (DLCX) command. The gateway then sends a return code in response to the request to delete connection. If the gateway accepts the request, it sends a 200 OK message with the following statistics about the connection to the CallManager: • Number of packets sent • Number of bytes sent • Number of packets received • Number of bytes received • Number of packets lost • Average jitter • Average transmission delay The CallManager uses an AuditEndpoint (AUEP) message to find information and status on the endpoint.
Single Site Deployment In the single site model, a central call agent serves one location, such as a building or campus. In small sites, this might be a Cisco CME. Larger sites might use a CallManager cluster. All telephones calls outside the site are sent through the PSTN. Telephone calls within the site traverse the LAN or perhaps metropolitan-area network (MAN). Figure 1-4 shows a typical single site deployment. Figure 1-4. Single Site Deployment Part I: Voice Gateways and Gatekeepers 31 32 Part I: Voice Gateways and Gatekeepers The example shows a small CallManager cluster used as the call agent.
Cisco Voice Gateways and Gatekeepers by David Mallory, Ken Salhoff, Visit Amazon's Denise Donohue Page, search results, Learn about Author Central, Denise Donohue,