Do-Not-Disturb (DDB)

This section describes the DDB service.

Definition

The DDB service enables a subscriber to reject all incoming calls during a specified period of time. After a subscriber registers the DDB service, all incoming calls to the subscriber are restricted but the outgoing calls of the subscriber are not restricted.

Benefits

Beneficiary	Description
Carriers	Carriers can gain more revenue.
Subscribers	Subscribers can reject all incoming calls during a specified period of time.

Requirements

Table 1 describes the requirements of the DDB service.

Table 1 Requirements of the DDB service

Item	Description
Required NE	SoftX3000	MRS
Function	The SoftX3000 provides the DDB service for subscribers.	The MRS plays announcements.
Requirements for the license	This service requires a license.

Application Limitations

None.

Interaction with Other Services

Table 2 describes the interaction between the DDB service and other services.

Table 2 Interaction between the DDB service and other services

Service	Interaction
Call forwarding busy (CFB)	The DDB service takes precedence over the CFB service.
Call forwarding no reply (CFNR)	The DDB service takes precedence over the CFNR service.
Call forwarding unconditional (CFU)	The CFU service takes precedence over the DDB service. In Hong Kong, the DDB takes precedence over the CFU service.
Call waiting (CW)	During the DDB period, the CW service is invalid and the DDB announcement is played. During other periods, the CW service is valid and the CW announcement is played.

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