JPS5919505B2 - Control method to prevent forgetting to cancel when forwarding calls - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a system in which all incoming calls are forwarded even after the subscriber returns to the location of the telephone because the subscriber who has registered for the call forwarding service forgets about it and does not perform the cancellation operation. This relates to a control method that prevents this from happening.

When registering for a call forwarding service, as shown in Figure 1, when subscriber SUB makes a call, the central processing unit CC detects this and connects to the call register trunk ORT via route 1 of the network NW, and registers the call. Receives a dial signal for (special number) 10 (transfer destination number) from SUB.

The central processing unit CC determines a missed transfer registration request based on the (special number) and writes (the transfer destination number) into the memory M. and,
Tone truck TNT on route 2 of network NW
from Tone Track TNT to subscriber S.
Sends a signal tone indicating registration completion to UB. From then on, when an incoming call is received from another subscriber to that telephone, the central processing unit CC refers to memory M, learns that call forwarding is being registered, and registers the call without connecting to that telephone. Connect to the destination phone.

In this case, in the conventional system, the registered telephone does not display the fact that call forwarding is being registered, so the only way is to rely on the person's memory.

However, busy subscribers often forget to do this, in which case all incoming calls are routed to the destination telephone. For example, if an incoming call for important matters happens to be transferred to a conference room, a problem arises because when the conference ends and no one is around, the call is released and treated as absent. The purpose of the present invention is to improve this problem by providing a system in which a registered subscriber who forgets to cancel registration can hear a special tone or talkie just by making a call once. The purpose is to give a warning and make the user perform the release operation.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram showing a control system for preventing forgetting to cancel when forwarding calls, FIG. 3 is a circuit diagram of a service trunk, and FIG. 4 is a layout diagram of a trunk package. Call forwarding services are generally difficult to implement with crossbar exchanges;
This can be easily implemented in a storage program type electronic exchange.

When a subscriber registers for call forwarding, it is assumed that the subscriber will immediately go to the location of the forwarding destination telephone, so generally the registered telephone cannot be used.

In this case, since the receiver is left on the receiver, there is no need to worry about forgetting the cancellation operation when the registered subscriber returns from the transfer destination. However, as another method, when a telephone that has been registered for call forwarding receives an incoming call, it connects to the forwarding destination, but it may be used for outgoing calls in the same way as other ordinary telephones. In this case, the receiver is left on the line, and the subscriber often forgets to cancel the call. In the present invention, as shown in FIG. 2, after the call forwarding registration, the subscriber SU
When B returns from the forwarding destination and goes off-hook while still registered, the central processing unit CC accesses the area of memory M whose address is the terminal number of the registered telephone, and indicates that the phone is currently being forwarded. First, the service trunk SVT is identified on route 1 of the network NW.
and makes the subscriber SUB hear a special sound indicating that call forwarding registration is in progress.

For example, a 400 Hz intermittent sound 120 times per minute may be used as the special sound. This special sound may be shared as a signal sound indicating that registration is in progress for other special services, such as cap-on service or speed dial service. That is, since it is considered that it is extremely rare for a plurality of special services to be registered at the same time, the same signal tone can be shared. Normally, a trunk has four parts in one package, as shown in Figure 4.
For example, in a tone trunk TNT, two circuits are used as a business tone trunk (BTT), one circuit is used as a ring back tone trunk (RBT), and one circuit is used as a service circuit.・Trunk (SVT
), there is no new trunk to design, and
All designs can remain the same as before.

In addition, when a registered subscriber SUB goes off hook while still registered, the system connects to the talkie trunk TKT and sends a talk message to the subscriber SUB for a certain period of time informing the subscriber that the subscriber SUB is registering for call forwarding. You can also listen to it.

In this way, after the special signal tone or talk from the service trunk SVT or the talk trunk TKT is made available to the subscriber SUB for a certain period of time, the central processing unit CC
connects to the calling register trunk 0RT on route 2 of the network NW, and allows you to listen to the general dial tone.

Subsequent dials from the subscriber SUB are received at the calling register/trunk 0RT in the same way as general outgoing calls, and are connected to the target subscriber or office line trunk. As another embodiment of the present invention, the service trunk SV in FIG.
Without using T, the central processing unit CC starts the originating register trunk 0 on route 2 of the network NW.
There is also a method of connecting to the RT and allowing the subscriber SUB to hear a special tone from the calling register trunk 0RT.

In this case, it is necessary to equip the outgoing register/trunk 0RT with a function that allows a special tone to be heard, so the amount of hardware for the outgoing register/trunk 0RT will be larger than in the case of Figure 1, and the outgoing register/trunk 0RT will need more hardware than the case shown in Figure 1.・Trunk 0
This is not necessarily economical when a large number of RTs are required.

However, the connection process to the originating register trunk 0RT only needs to be performed once. In this case as well, the outgoing register trunk 0
First, a special tone is sent out for a certain period of time from the RT, and then a dial tone is sent out, and subsequent dial reception is performed at the outgoing register trunk 0RT in the same way as for general outgoing calls.

For example, as shown in Figure 3, the service trunk SVT is equipped with a three-winding relay A, and one winding of the A relay is connected to a signal via the transformer of the rack on which the service trunk is mounted. Combined with SIG's special sound source.

In FIG. 2, when the route 1 of the network NW is closed and the service trunk SVT is connected to the subscriber SUB, the telephone loop of the subscriber SUB
The relay operates, contact a1 of the A relay closes, a special sound is induced from the winding connected to the transformer to the remaining two windings, and the special sound is sent to the subscriber SUB for a certain period of time.

Subsequently, a dial tone is sent from the calling register trunk 0RT, so that the subscriber SUB can recognize that call forwarding registration is in progress. Subscriber SUB may immediately cancel the call forwarding registration by listening to the dial tone and then dialing (special number) + (forwarding destination number), or may cancel the call forwarding registration after talking to another subscriber. You may do so. As explained above, according to the present invention, even if a subscriber who has registered for call forwarding forgets to cancel the call forwarding operation, the subscriber can still hear the special tone or talkie if he or she makes a call even once. Since the user immediately notices that the user has not canceled the absentee registration, important incoming calls are forwarded and fewer missed calls are processed, and problems are avoided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the connection for registering a call forwarding service, FIG. 2 is a block diagram showing a control system for preventing forgetting to cancel when forwarding a call according to an embodiment of the present invention, and FIG. 3 is a diagram showing the service trunk in FIG. 2. FIG. 4 is a layout diagram of the trunk package.

Claims (1)

[Claims] 1. If a subscriber registers for call forwarding and then goes off-hook without canceling the registration at an automatic exchange that provides call forwarding service, the subscriber will be connected to the service trunk via the network and the subscriber will not be able to subscribe to the call forwarding service. A control method for preventing forgetting to release the call when forwarding is canceled, which is characterized in that after the person hears a special sound for a certain period of time indicating that the caller is registering for call forwarding, the network is connected to the calling register trunk and the caller hears the dial tone. .