JPH0294854A - Holding call transfer method for cordless telephone set - Google Patents

Abstract

PURPOSE:To eliminate the need for the operation of all slave sets to be transited to one and same speech channel during talking and to reduce the current consumption by allowing a master set to hold a telephone line when a slave set applies holding transfer operation during the talking, using a control channel and applying an extension call processing to the slave set being a transfer destination. CONSTITUTION:While the master set 10 and a slave set 1-1 are busy with each other, the slave set 1-1 sends a transfer request signal through a speech channel together with a slave set number being a transfer destination to turn off the transmission. In this case, the mode reaches the standby state in the control channel. The master set 10 holds the telephone line to send an extension call signal through the control channel together with a designation signal of a speech channel and an identification code (ID1-2) of the slave set being the transfer destination. Upon the receipt of an extension call signal, the slave set 1-2 being the transfer destination sends the extension call reply signal together with an identification code ID1-2. When the slave set 1-2 hooks off, the master set 10 releases the holding of the telephone line and the mode is transited to the speech state by the slave set 1-2 to complete the holding transfer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hold transfer operation of a handset during a call in a cordless telephone.

[Conventional technology]

A cordless telephone consists of a base unit and one or more handsets.When the base unit connected to a telephone line receives an incoming call signal, a specific handset is connected to the telephone line via a wireless line, and the call line is connected to the base unit. When making a call, the slave unit sends a call signal from the base unit to the telephone line via the wireless line. The wireless line has a control channel (1 to 2 channels) and multiple communication channels (several 10 channels), and the former is used for handset and
The latter is used for the connection between base units, and for ringing and talking. Technical standards for cordless telephones are stipulated by radio regulations.

The present invention relates to a hold transfer operation of a handset during a call, and a conventional method will be explained with reference to FIG. Figure 5 shows handset 1-1, which is in use as a handset,
A sequence diagram between the handset and handset 1-2 in a standby state is shown. In this sequence diagram and FIGS. 1 to 3, which will be described later, the control channel and communication channel are
CH, SCH.

In a conventional cordless telephone, while the base unit and the handset 11 are talking, the other handset 1-2 is guided to the same communication channel and is in a standby state in which transmission is turned off and reception is enabled.

Therefore, all the hold transfer operations described below are performed on the communication channel. The handset 1-1 sends out a transfer request signal together with the forwarding destination handset number, turns off transmission, and displays that the transfer process is in progress. When the base unit receives the transfer request signal, it holds the telephone line and sends an extension ringing signal together with the transfer destination handset number. When the transfer destination handset 1-2 receives the extension calling signal along with its own handset number,
Turn on transmission and send an extension call response signal along with the handset number. The base unit receives the extension call response signal 2 and sends out a ring tone signal. When the handset 1-2 receives the ringing tone signal, it sounds the extension ringing tone. When handset 1-2 performs an off-footer operation in order to respond to the extension ringing tone and proceed to a call, an off-hook signal is sent together with the handset number.

When the base unit receives the off-footer signal, it releases the telephone line from hold and sends a transfer end signal to the slave unit 1-1. When the handset 1-1 receives the transfer end signal, it turns off the display indicating that the transfer process is in progress, stops transmitting, and enters a standby state on the same communication channel, allowing only reception.

After releasing the hold, the base unit and handset 1-2 shift to a talking state.

[Problem to be solved by the invention]

As mentioned above, the conventional method for hold transfer processing is to guide all handsets that are not currently on a call to the same call channel and wait for transmission, and then perform hold transfer processing using the call channel that is currently being used for the call. It is something. Here, since the handset is a handy type and operates on a battery, it is conceivable to use it by turning off the power switch, considering that the battery will be consumed even in the standby mode. However, even if you turn on the power switch of a handset with the power switch turned off and try to receive a hold transfer from a handset that is currently on a call, you cannot switch the call channel because it is unknown which channel the call is. Transfer processing is not possible. As a result, as a slave unit, the power switch must be kept on at all times, resulting in the disadvantage that battery consumption cannot be avoided.

An object of the present invention is to provide a pending transfer method that eliminates the above-mentioned drawbacks.

[Means to solve the problem]

In the present invention, the base unit connected to the telephone line has at least one
In a cordless telephone connected to a plurality of slave units via a wireless line having one control channel and a plurality of call channels, the base unit receives a calling signal from the telephone line,
When the handset of No. 1 is guided to a call channel using the handset's identification code and the handset performs a hold transfer operation while the handset is talking, the base unit puts the phone line on hold and transfers using the control channel. This is so that the extension call process is performed on the previous handset. If the base unit does not receive an extension call response signal within a certain period of time from the destination handset, or if it does not receive an off-hook signal within a certain period of time after sending a ring tone signal, it must first perform a hold transfer operation. Extend call processing is performed on the handset.

[Effect]

When the base unit receives a calling signal from the telephone line, the base unit uses the identification code of the slave unit to guide one of the slave units to the communication channel and puts it into a conversation state. At this time, other handsets are in a standby state for the control channel. During hold transfer processing for the handset during a call, the base unit uses the control chaple to make an extension call.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. 1 to 3 are sequence diagrams showing the procedure of the present invention, and FIG. 4 is a block diagram showing the outline of the apparatus.

First, the outline of the apparatus used in this method will be explained with reference to FIG. The base unit IO is connected to the telephone port 81jll, and is also connected to the slave units 20 (11 to 20 (N)) via the wireless line from the antenna 9 which is the output.
In line relay 2.0, line relay 2. Dial sending circuit 3.
A path is formed through a 2-4 wire conversion circuit 4 to a wireless transmitter/receiver 5, and the circuit is controlled by a control section 6. I
DROM7 has parent 'a 10 and child Ja 20 (1
) to 20 (N) Both 1ffl (7) By FAk: 1-doard IDI is registered.

It also has a timer 8 controlled by the control section 6.

The common parts 29 of the slave units 20 (11 to 20 (N)) all have the same configuration, and only the IDROM 28 is different.

However, the same common identification code TDI as IDROM7 is included and registered in 28f1) to 28f1) to 2B(N). Handset 23. The transmitter 24 is connected to the wireless transceiver 16 by an audio circuit switch 25 and communicates wirelessly with the antenna 9 of the base unit 10 via the antenna 21 . The control unit 26 controls the wireless transceiver 22. Identification code unique to the handset,
The handset number is registered in IDROMZ8. The dial/function button section 27 can be operated in the same manner as a normal telephone operation.

The pending transfer process according to the present invention will be explained below with reference to the sequence diagram shown in FIG. In this example, handset 11, handset 1-2
are shown as representative examples, but none of them are specific. In addition, signals from the control channel and signals from the communication channel are shown separately. At present, the base unit IO and the handset 1-1 are already in a conversation state using the communication channel (2), and the handset 1-2 is in a standby state on the control channel.

When base unit 10 and handset 1-1 perform a hold transfer operation during a call, handset 1-1 sends a transfer request signal along with the transfer destination handset number using the communication channel and turns off transmission. do. At this time, it enters a standby state on the control channel. !
! 'When a machine receives a request signal of 10 and 0, it puts the telephone line on hold and transfers the extension ringing signal to the identification code (IDI) of the destination handset.
-2) as well as a designated signal for communication channel (3), which is transmitted using the control channel. Transfer destination slave device】-2
When receiving the extension call signal, it sends an extension call response signal together with the identification code IDl-2. When the base unit 10 receives the extension call response signal, it switches to the communication channel (3) and waits for a signal from the slave unit 1-2. After sending out the extension call response signal, the child 4a1-2 switches to the communication channel (3) and sends out a channel switching completion signal.

When the base unit 10 receives the channel switching completion signal, it sends out a discharge sound ringing signal. When the handset 1-2 receives the ringing tone signal, it sounds the extension ringing tone. In order to respond to the extension ringing tone and proceed to a call, when the child a1-2 performs an off-hook operation, it sends an off-hook signal. When the parent a 10 receives the off-hook signal, it releases the telephone line from hold, shifts to a talking state using the handset 1-2, and completes the hold transfer. In the above explanation, channels different from call channels (2) and (31) are used, but the same channel can be used if it is free.

Next, processing when the power switch of the transfer destination handset is turned off, and even if there is an extension ringing signal, it is not received and the ringing tone does not sound will be explained with reference to the sequence diagram of FIG. The process up to step 31 is step 21 in Figure 1.
Since this process is the same as the previous process, the explanation will be omitted. Handset 1-
2 is inoperable, so the base unit IO cannot receive the extension call response signal. If, for example, 1 to 2 seconds pass in this state, it is determined that the call cannot be made. Since handset 1-2 is able to receive data intermittently in the standby state,
and set it to a value that minimizes the hold time on the telephone line. Note that this time is measured by a timer 8. When a certain period of time has elapsed, a timer-out signal is generated, so base unit 10 stops calling handset 1-2, and sends an extension calling signal to notify handset 1-1 that the transfer destination is inoperable.

Here, the processing of the master device 10 and the slave device 1-1 after step 32 is the same as that from step 22 in FIG.

Since this process is similar to that of the slave unit 1-2, the explanation will be omitted.

Furthermore, even if there is a ringing movement on the destination handset,
The processing when off-hook is not performed will be explained with reference to the sequence diagram in FIG. 3. The processing up to step 7 41 is the same as up to step 23 in FIG. 1, so the explanation will be omitted. When a certain period of time elapses with the base unit 10 unable to receive an off-hook signal while the extension ring tone is ringing on the child a1-2, the timer 8 generates a timer-out signal. This fixed time is set to be longer than the response delay time at the transfer destination, and is set to a value that minimizes the holding time of the telephone line. For example, 20 to 30 seconds.

Then, in order to stop the ringing process of child fil-2, the base unit IO sends out a ringing stop signal and switches to the control channel. When the handset 1-2 receives the ringing stop signal, it stops ringing the extension ringer and enters a standby state on the control channel. After that, the child 4ffll that performed the pending transfer operation first
-1, performs extension call processing to notify that the transfer has not been completed. Here, the processing after step 42 is the same as the processing after step 32 in FIG. 2, so the explanation will be omitted.

[Effects of the Invention] As described above, the device is composed of a base unit connected to a telephone line and a plurality of slave units connected to the base unit via a wireless line, and has at least one control channel as the wireless line. In cordless telephone systems that use multiple call channels, hold transfer processing is performed via the control channel, so there is no need for all handsets to switch to the same call channel during a call. Current consumption can be reduced accordingly.

In addition, because the hold transfer process is performed on the control channel, even if the power switch is turned off when another handset receives a call or starts call processing, the handset hears the ring tone of the other handset.
Even if you turn on the power switch during a call, you can perform hold transfer processing, which enhances functionality.

Furthermore, since the extension calling process of the hold transfer process is similar to the normal incoming call process, the software can be streamlined by making the processes common.

[Brief explanation of drawings]

1 to 3 are sequence diagrams of an embodiment of the present invention, FIG. 4 is a schematic block diagram of a cordless telephone according to the embodiment, and FIG. 5 is a sequence diagram of a conventional example. ■-telephone line, 2 line relay 3-dial sending circuit, 4-2-4'KFA conversion circuit, 5.22--wireless transmitter/receiver, 6.26-control unit, 7
．． 28-I DROM, 8--Tie 7.9.21・
・-Antenna, 10-Base unit, 20-7-a, 23-Telephone receiver, 24-Speaker, 25-Switch, 27-Tail/function button section. Figure 1

Claims (1)

[Claims] 1. A cordless telephone in which a base unit connected to a telephone line is connected to a plurality of slave units via a wireless line having at least one control channel and a plurality of communication channels. When the base unit receives a call signal from the telephone line, guides the first handset to the call channel using the handset's identification code, and performs a hold transfer operation while said handset is busy, the base unit connects to the telephone line. 1. A hold transfer method for a cordless telephone, characterized in that after putting the call on hold, a control channel is used to process an extension call to a transfer destination handset. 2. If the base unit does not receive an extension call response signal from the transfer destination slave unit after a certain period of time, the base unit performs the extension call process on the slave unit that previously performed the hold transfer operation, thereby making the transfer process impossible. 2. The hold transfer method for a cordless telephone set according to claim 1, further comprising the step of notifying the user that the cordless telephone has received a call. 3. If the base unit does not receive an off-hook signal even after a certain period of time has passed after sending the ring tone signal to the transfer destination handset, it will perform an extension call process on the handset that performed the hold transfer operation first. 2. The hold transfer method for a cordless telephone according to claim 1, further comprising notifying that transfer processing is impossible.