Call Control Discovery Function for SAF Network | Cisco Exam 400-051 Answer

Call Control Discovery Function

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Which Call Control Discovery function allows the local Cisco Unified Communications Manager to listen for advertisements from remote call-control entities that use the SAF network?



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A. B. C. D. E.


SAF and CCD will allow large distributed multi-cluster deployments to have the directory number (DN) ranges of each call routing element advertised dynamically over SAF.

Cisco routers act as SAF Forwarders (SAFF), while the call routing elements (e.g.

CUCM) act as clients that register with the routers to advertise their DN ranges and listen to the advertisements of other routers.

The correct answer to the question is option A - CCD advertising service.

Call Control Discovery (CCD) is a mechanism that allows a Cisco Unified Communications Manager (CUCM) to discover and interoperate with remote call-control entities such as Session Border Controllers (SBCs) and gatekeepers. CCD works by exchanging Service Advertisement Framework (SAF) messages between the CUCM and the remote entities.

The SAF network is a signaling infrastructure that allows IP telephony and other related applications to exchange service advertisements, also known as SAF advertisements. These advertisements are used by call-control entities to announce their services to other entities on the network.

In the context of CCD, the CCD advertising service is responsible for allowing the local CUCM to listen for SAF advertisements from remote call-control entities. When a remote entity sends a SAF advertisement announcing its call-control services, the CUCM uses the information in the advertisement to establish a connection with the remote entity and to interoperate with it.

Option B - CCD requesting service - is incorrect because it refers to the function that allows the CUCM to request information about remote call-control entities. This function is used when the CUCM wants to discover new entities on the network or obtain updated information about existing entities.

Option C - SAF forwarder - is incorrect because it refers to a device that forwards SAF messages between the different entities on the SAF network. The SAF forwarder is not directly related to CCD.

Option D - SAF enabled trunks - is incorrect because it refers to a type of trunk that supports the exchange of SAF messages between the CUCM and remote call-control entities. SAF enabled trunks are used in conjunction with CCD, but they are not a function of CCD.

Option E - CCD registration service - is incorrect because it refers to the function that allows remote call-control entities to register with the CUCM. This function is used by the remote entities to announce their presence to the CUCM and to provide information about their call-control services.