This chapter deals with the complex world of VoIP gateway systems. These systems are responsible for 640-822 providing some amount of call control and routing from VoIP phone devices.
Each of these systems is responsible for receiving calls from a VoIP handset, ATA or softphone device via a supported VoIP protocol, consulting a dial-plan or other call routing table, and correctly routing the call. Other features made available by some or all of these gateways include:
Authentication - 642-426 Ensuring that clients have permission to use VoIP resources.
Call Accounting - Providing tracking of calls via the gateway, including reports and cost controls.
Complex Dialplans - Most dialplans configured on simple devices such as ATAs and softphones only 642-523 allow for a very straightforward dialplan configuration. Using a VoIP gateway such as Asterisk, factors such as time of day, or even values obtained from external sources can be used to determine which path a call should take.
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