Explanation/Reference:
Privacy release supports shared extensions among several devices, ensuring that only one device at a time can use an extension.
For you exam you should know below mentioned PBX features and Risks:
System Features
Description
Risk
Automatic Call distribution
Allows a PBX to be configured so that incoming calls are distributed to the next available agent or placed on-hold until one become available Tapping and control of traffic Call forwarding Allow specifying an alternate number to which calls will be forwarded based on certain condition User tracking Account codes Used to:
Track calls made by certain people or for certain projects for appropriate billing Dial-In system access (user dials from outside and gain access to normal feature of the PBX) Changing the user class of service so a user can access a different set of features (i.e. the override feature) Fraud, user tracking, non authorized features Access Codes Key for access to specific feature from the part of users with simple instruments, i.e. traditional analog phones.
Non-authorized features
Silent Monitoring
Silently monitors other calls
Eavesdropping
Conferencing
Allows for conversation among several users
Eavesdropping, by adding unwanted/unknown parties to a conference
override(intrude)
Provides for the possibility to break into a busy line to inform another user an important message Eavesdropping Auto-answer Allows an instrument to automatically go when called usually gives an auditor or visible warning which can easily turned off Gaining information not normally available, for various purpose Tenanting Limits system user access to only those users who belong to the same tenant group - useful when one company leases out part of its building to other companies and tenants share an attendant, trunk lines,etc Illegal usage, fraud, eavesdropping Voice mail Stores messages centrally and - by using a password - allows for retrieval from inside or outside lines.
Disclosure or destruction of all messages of a user when that user's password in known or discovered by an intruder, disabling of the voice mail system and even the entire switch by lengthy messages or embedded codes, illegal access to external lines.
Privacy release
Supports shared extensions among several devices, ensuring that only one device at a time can use an extension. Privacy release disables the security by allowing devices to connect to an extension already in use.
Eavesdropping
No busy extension
Allows calls to an in-use extension to be added to a conference when that extension is on conference and already off-hook Eavesdropping a conference in progress Diagnostics Allows for bypassing normal call restriction procedures. This kind of diagnostic is sometimes available from any connected device. It is a separate feature, in addition to the normal maintenance terminal or attendant diagnostics Fraud and illegal usage Camp-on or call waiting When activated, sends a visual audible warning to an off-hook instrument that is receiving another call.
Another option of this feature is to conference with the camped-on or call waiting Making the called individual a party to a conference without knowing it.
Dedicated connections
Connections made through the PBX without using the normal dialing sequences. It can be used to create hot-lines between devices i.e. one rings when the other goes off-hook. It is also used for data connections between devices and the central processing facility Eavesdropping on a line The following were incorrect answers:
Call forwarding - Allow specifying an alternate number to which calls will be forwarded based on certain condition Tenanting -Limits system user access to only those users who belong to the same tenant group - useful when one company leases out part of its building to other companies and tenants share an attendant, trunk lines,etc Voice Mail -Stores messages centrally and - by using a password - allows for retrieval from inside or outside lines.
The following reference(s) were/was used to create this question:
CISA review manual 2014 Page number358

The organization is primarily responsible for the security configurations of the deployed application's operating system when migrating its HR application to an Infrastructure as a Service (IaaS) model in a private cloud. This is because in an IaaS model, the cloud provider is responsible for the security of the underlying infrastructure that they lease to their customers, such as servers, storage, and networks, while the customer is responsible for the security of the areas of the cloud infrastructure over which they have control, such as operating systems, middleware, and applications. Therefore, the organization needs to ensure that the operating system is properly configured, patched, hardened, and monitored to protect the HR application from unauthorized access or malicious attacks.
The other options are not primarily responsible for the security configurations of the deployed application's operating system. The cloud provider's external auditor is not responsible for any security configurations, but rather for verifying and reporting on the cloud provider's compliance with relevant standards and regulations.
The cloud provider is responsible for the security of the underlying infrastructure, but not for the operating system or any software installed on it by the customer. The operating system vendor is responsible for providing updates and patches for the operating system, but not for configuring or securing it according to the customer's needs.
References:
* 11: What Is IaaS (Infrastructure As A Service)? - Forbes
* 12: What is Shared Responsibility Model? - Check Point Software
* 13: Who Is Responsible for Cloud Security? - Security Intelligence