2.4 Waiting:

• Call Waiting (CW). If the subscriber, who has this service registered, receives the call from the third party, the subscriber will hear the corresponding tone signal, which informs about the receiving a new call. During this the call subscriber C hears Ring back tone and waits for the answer of the subscriber A. It is setup for Feature Set.

• Call Intrusion (CINT). It allows the subscriber C using the service to interfere in the active conversation of subscribers A and B. Such variants are possible:

• The connection to the busy subscriber is Not Allowed;

• The connection to the busy subscriber With Tone Indication;

• The connection to the busy subscriber Without Tone Indication;

• The connection of a Dispatcher to the busy subscriber.

The modes of the service execution, Invocation Mode:

• The service is Not Active;

• The connection to the busy subscriber on demand, Consultation;

• The automatic connection to the busy subscriber, Network;

• Call Intrusion Protection (CINTP). It blocks all possibilities of the function CINT.

2.5 Barring of the calls:

• Do Not Disturb (DND). The subscriber who doesn’t want to be disturbed by means of the special procedure can activate the service. The service does not forbid outgoing calls of the subscriber who uses it. The call subscriber with the activated service does not receive indication, informing about receiving a call. The call subscriber, who dials the number of the subscriber with this service, receives the indication of the permanent ban on incoming communication. For its execution only activation is required.

If the subscriber A uses the service of DND cancellation (DNDO), the terminal of the subscriber B will receive the incoming call.

• Selective Call Acceptance/Selective Call Rejection (SCA/SCR). These services allow a subscriber to accept/reject only those calls, the subscriber numbers of which are included in his white/black list, the type of the list is defined by the parameter List Mode, its length – List Size. For administration of services SCA/SCR it is used the window, opened by the button More on the tab Barring. There such rights are managed: right for CgPN (checking of the call number), for RgPN (checking of the last forwarded number) lists for service execution.

For administration of a number list for acceptance/rejection the window Selective Call Acceptance/Rejection is used. In it such parameters are specified: the type of the service (Feature), the prefix of the calling number CgPN (CgPN Prefix), the destination number (Destination DN).

• Selective Call Originating (SCO). This service allows a subscriber to limit outgoing calls. The limitation is executed by the way of comparing dialed numbers with numbers or their prefixes included in the black or white lists. Managing is the same as it it for the service SCA/SCR.

2.6 Abbreviation:

• Fixed Destination Call Immediate (HOTI). When the subscriber with this service picks up the handset, without Dial Tone, the dialing of preset number happens. Calling subscriber number, Destination DN is specified in the corresponding field. The provided connection is executed identically as the subscriber would do it manually.

• Fixed Destination Call with Time-out (HOTD). When the subscriber picks up the handset, the timer is started. The subscriber receives acoustic indication of the start of execution of the service HOTD. If the subscriber dials digits until expiration time, the execution of the service will stopped and the subscriber continues to setup connection in the normal mode. If the subscriber dials nothing until expiration time, the system will automatically set up the connection with preset number. The subscriber receives the indication of dialing a number HOTD.

In details the possibilities of work with abbreviation will be considered in next segments.