In CCM, which two functions does the gatekeeper perform? (Choose two)
A.
Call routing
B.
Conference controller
C.
Call admission control
D.
E.164 dial plan resolution
Explanation:
Gatekeeper Functionality
The H.323 standard defines mandatory and optional gatekeeper functions:
Mandatory Gatekeeper Functions
* Address Translation- Translates H.323 IDs (such as gwy1@domain.com) and E.164 numbers (standard telephone numbers) to endpoint IP addresses.
* Admission Control- Controls endpoint admission into the H.323 network. In order to achieve this, the gatekeeper uses these:
o H.225 Registration, Admission, and Status (RAS) messages o Admission Request (ARQ)
o Admission Confirm (ACF)
o Admission Reject (ARJ)
* Bandwidth Control- Consists of managing endpoint bandwidth requirements. In order to achieve this, the gatekeeper uses these H.225 RAS messages:
o Bandwidth Request (BRQ)
o Bandwidth Confirm (BCF)
o Bandwidth Reject (BRJ)
* Zone Management- The gatekeeper provides zone management for all registered endpoints in the zone. For example, controlling the endpoint registration process.
Optional Gatekeeper Functions
* Call Authorization- With this option, the gatekeeper can restrict access to certain terminals or gateways and/or have time-of-day policies restrict access.
* Call Management- With this option, the gatekeeper maintains active call information and uses it to indicate busy endpoints or redirect calls.
* Bandwidth Management – With this option, the gatekeeper can reject admission when the required bandwidth is not available.
* Call Control Signaling- With this option, the gatekeeper can route call-signaling messages between H.323 endpoints with the use of the Gatekeeper-Routed Call Signaling (GKRCS) model. Alternatively, it allows endpoints to send H.225 call-signaling messages directly to each other.
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