Which parameter in an RQNT message is used by a Cisco Unified CM to request a Cisco IOS MGCP gateway to report an on-hook event on an analog endpoint?
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A. B. C. D. E.C.
In the context of MGCP (Media Gateway Control Protocol), RQNT (Request Notification) messages are used to request notification of certain events on an endpoint attached to a Cisco IOS MGCP gateway.
Of the options provided, the parameter that would be used to request a Cisco IOS MGCP gateway to report an on-hook event on an analog endpoint is "Requested Events". Therefore, the correct answer is C.
Explanation:
When a Cisco Unified CM needs to request a notification of a specific event on an endpoint, it sends an RQNT message to the Cisco IOS MGCP gateway. The RQNT message contains several parameters, including "Requested Events". This parameter specifies the type of event that the Cisco Unified CM is interested in receiving notifications for.
In this case, the Cisco Unified CM would set the "Requested Events" parameter to indicate that it wants to receive notifications when the analog endpoint goes on-hook. When the analog endpoint goes on-hook, the Cisco IOS MGCP gateway will send an NTFY (Notify) message to the Cisco Unified CM, indicating that the requested event has occurred.
The other parameters listed in the answer choices are also used in MGCP messaging, but they are not directly relevant to this scenario. Here's a brief overview of what each parameter does:
Detect Events: Specifies the types of events that the gateway should detect and report to the call agent ( Cisco Unified CM). This parameter is typically used in conjunction with "Requested Events".
Connection Mode: Specifies the type of connection to be established between the gateway and the endpoint (e.g., FXO, FXS, E&M).
Event States: Specifies the current state of a specific event on an endpoint. This parameter is used in NOTIFY messages to provide information about the current state of an event.
Observed Events: Specifies the types of events that the gateway has observed and reported to the call agent. This parameter is typically used in response messages (e.g., MDCX response) to indicate which events have been observed and reported.