DE3911915A1 - Microprocessor-controlled telephone call redirection device - uses selection information held in memory to re-direct call from incoming line to outgoing line - Google Patents

Abstract

The call re-direction device has a memory (SP) containing selection information, coupled to a microprocessor (MP). The device is connected to the telephone network via 2 main lines (L1,L2), the microprocessor (MP) responding to an incoming call on one line (L1) to re-direct the call in dependance on the stored selection information using the second line (L2), with the 2 lines (L1,L2) switched through when the call re-direction is established. Pref. the memory contains text information for informing the caller during holding of the call, while the call re-direction is effected. ADVANTAGE - Simple call re-direction for home subscriber.

Description

The invention relates to a subscriber device according to the preamble of claim 1.

It is known to receive incoming calls from a staff subscriber line not busy by a automatic answering machine (private Additional device). To Only one must be carried out Switching device are actuated, the changeover the main line from the telephone to the automatic answering machine or information provider makes.

Also located in the headquarters of a private branch exchange automatic answering machines are known (cf. for example, DE-PS 31 04 565), which is not busy extensions on the central answering machine be switched. Private branch exchanges usually have the Features: Brokering, transferring, call forwarding or Call forwarding on. From DE-PS 21 03 973 is one Circuit arrangement for forwarding control of calls the answering machine known, in which the switching process controlled by a working time recording device  becomes. By combining such answering machines only with that arranged in the private branch exchange Switching device becomes a reliable one Answering for the different Subscriber lines of the private branch exchange incoming Allows calls.

Private additional facilities are also known, where automatic answering machines or Information provider with automatic dialing aids and Redialers (automatic dialers) are combined, like this for example in DE-OS 36 08 238 or DE-OS 36 08 239 with the same content is described. The Features of the telephone computer known from it include: "Message recording, remote access and Call forwarding ". Call forwarding means in Connection with private additional facilities always (cf. for example magazine: "Orgadata", 1/84, pages 20-21; Magazine: "net news electronics + Telematik "38 (1984), No. 3, pages 110-114; Magazine: "Funkschau" 20/1986, pages 36-40 and DE-OS 36 08 238) following sequence of procedures: With the answering machine the message of the caller is recorded, then the automatic dialer is activated and the owner of the answering machine is automatically over the European paging service or via Telecommunications network called. For this, the automatic dialer guides  establish a connection based on one or more beforehand stored numbers and when reporting the the called subscriber is asked (announcement text), the owner of the answering machine to the set to fetch. The message recorded by the answering machine of the caller can then from the owner of the answering machine over the telecommunications network with the code transmitter carried can be queried remotely. The call charges are not at the expense of the called party, but to Answering machine owner charges.

With such a sequence of processes can largely ensure that the called but absent Participants can quickly respond to a call however, a remote query of the recorded message To be able to carry out, however, he must have a code transmitter lead oneself. It is known that remote access is also by speaking a code from the owner of the To activate the answering machine has this procedure however, proved to be very unreliable in practice proven.

Even if through such private additional facilities Accessibility of a called but absent Participant could be shown in the daily practice again and again that the relatively often Caller hangs up during or after the announcement or that the Caller does not say important information, e.g. the  own phone number or that the caller is so indistinct speaks that the owner of the answering machine cannot understand the recorded message.

The invention has for its object a To design the subscriber facility such that a rapid information of the called but absent Participant is enabled via a call.

This task is done with a generic Subscriber facility by the characteristic features of claim 1 solved.

The subscriber device according to the invention offers for the Participants the new feature of Call transfer. This means that even when you are away of the called party in a surprisingly simple way and how the state of conversation is established. Furthermore, the subscriber device according to the invention on all communication networks for switched connections be used.

In the embodiment of the subscriber device according to Claim 2 receive both the called but absent Participant as well as the calling participant a hint that a call is switched through.

In the embodiment of the subscriber device according to Claim 3 can in the subscriber facility anyway  existing facilities for call routing be shared. Although in the above Answering machines described in magazine articles two main connection lines can be connected, the possibility of a call transfer is not once hinted at.

Furthermore, the various possibilities, which Offer answering machines, also at Subscriber facility can be used, with the operator guidance is possible in accordance with the announcements.

The can also be used in private branch exchanges Participation facility are used. In advantageous Way becomes easier by performing Mediation functions in the microprocessor-controlled Subscriber device, the switching device in the Private branch exchange relieved.

The microprocessor-controlled subscriber device according to claims 1 to 4 can be used in a wide variety of communication networks for switched connections, for example telex network, data network, integrated digital network, integrated service network, public mobile land radio network ( MATS ) etc., and offers a large number of different possible uses. If, for example, the called subscriber is currently in a call via a duplex transmission channel, e.g. main connection line, a message (e.g. announcement or information) can be transmitted to the calling subscriber via the other main connection line, in which way they can, for example, a) "call waiting" (e.g. by sending out identifiers and thereby inserting an advisory tone into the already existing connection or optical signaling on the subscriber device), b) while the called subscriber continues to speak, can transmit his number to the called subscriber c) send another message (e.g. text) can etc. "brokering" or the formation of a "three-party conference" is also possible.

Instructs the subscriber device according to claim 6 a hybrid with or without a replica network and connected to it, adjustable amplifiers, it is not just like private ones Additional equipment a half duplex, but a Enables duplex operation of the subscriber facility, whereby good at every stage of the conversation Voice quality is ensured.

The invention is based on one in the Drawing shown embodiment described in more detail and explained. It is used by private Additional devices ran out. The invention can however used in all subscriber facilities  which have at least two Main connecting lines or two radio channels with the Telecommunications network are connected and at which one Voting machine is arranged.

In the embodiment shown in the figure the subscriber device contains an automatic one Answering machine without message recording, which one two main connection lines are connected and which one with those required for call routing Facilities is supplemented (additional two Hybrid circuits, an adjustable amplifier, a Loop current detection circuit), and one Telephone set. In the figure are for relief understanding of the invention, only that of the Invention affected devices shown.

The subscriber device is connected to the telecommunications network via the two main connecting lines L 1 , L 2 . If a call signal arrives via one of the two main connecting lines L 1 or L 2 , this is recognized by means of call receiving circuit RE 1 or RE 2 . A microprocessor MP is connected to the call receiving circuit RE 1 or RE 2 and controlled by this, the connection to the calling subscriber is established. The answering machine or the telephone set downstream of it can also be supplied from the public battery via the main connecting lines L 1 or L 2 . Controlled by the microprocessor MP , the announcement text contained in the announcement memory ASP is read out and transmitted to the calling subscriber via the main connecting line L 1 or L 2 . If the handset is picked up on the telephone during the transmission of the announcement text, a loop current detection circuit SÜ 1 or SÜ 2 detects the lift off and controlled by the microprocessor MP , a switchover to telephone operation takes place and an initiated dialing process is terminated. The switchover to telephone operation is also carried out if the loop current is switched off for longer than, for example, one second as a result of the connection being triggered or a fault in the main connecting line L 1 or L 2 , for which purpose a loop current detection circuit (not shown in the drawing) is provided.

Furthermore, a speech pause detection circuit with audio tone detection SE is arranged in the subscriber device, which - for example in the case of speech pauses longer than 8 seconds or detection of an audio tone - also generates a control signal and is controlled by the microprocessor MP to switch to telephone mode.

Furthermore, the microprocessor MP is connected to a memory SP with dialing information (eg telephone numbers). The microprocessor MP assumes the function of an automatic dialing device and can also perform a switching function, this controlling the exchange of switching-technical information between the subscriber device and the control device of the switching centers of the telecommunications network.

For call forwarding, the microprocessor MP holds the connection established via one main connection line, for example L 1 , and initiates a second connection establishment on the basis of the stored dialing information via the other main connection line L 2 . The calling subscriber receives an announcement text, for example: "Please wait a moment, your call will be forwarded free of charge". When the called subscriber reports, the subscriber receives, for example, the announcement text: "Transfer, phone number ... please take over the call". Then the microprocessor MP switches the call through so that a call can be established between the calling subscriber and the called subscriber via the main connecting line L 1 , hybrid circuit G , amplifier V 1 or V 2 and main connecting line L 2 .

The state of the conversation is monitored by audible tone detection or speech pause detection. Controlled by the microprocessor MP , before the connection is triggered via the main connecting line L 1 or L 2, the announcement is: "Switching here, are you still speaking?" transmitted to prevent accidental interruptions during pauses in speech.

In the embodiment shown in the figure, a number switch pulse contact nsi is provided, which is used to generate pulse series. Other embodiments, for example electrical switches or the generation of the dialing information using the multi-frequency code dialing method, can be used in the subscriber facility. Likewise, instead of the embodiment of the hybrid circuit G with transformer, electronic hybrid circuits with automatic line impedance matching and / or a line length-dependent gain control can also be used. In order to switch off the speech circuit during the dialing, an nsa contact controlled by the microprocessor MP is also provided in the subscriber device.

The microprocessor-controlled according to the invention Subscriber setup allows on surprising simple way of switching the call and the Establishing a state of conversation. Furthermore, this can on all communication networks for switched connections be used.

Claims (7)

1. Subscriber device, which is connected to the telecommunications network and which has a memory ( SP ) with dialing information and a microprocessor ( MP ) connected to this, which controls the exchange of switching information between the subscriber device and the control device of the exchanges of the telecommunications network, characterized in that the subscriber device is connected to the telecommunications network via at least two main connecting lines ( L 1 , L 2 ), and that the microprocessor ( MP ) for call forwarding maintains the connection established via one main connecting line (eg L 1 ), based on the stored dialing information, via the other The main connecting line (eg L 2 ) initiates a second connection setup and when the called subscriber device reports the connection is switched through via the two main connecting lines ( L 1 , L 2 ). 2. Subscriber device according to claim 1, characterized in that an instruction text memory is integrated in the subscriber device and that the microprocessor ( MP ) controls a call to keep the connection and a further message to the called subscriber when reporting the called party. 3. Subscriber device according to claim 1, characterized in that an automatic answering machine with or without message recording is integrated in the subscriber device and that the microprocessor ( MP ) when holding the connection controls the caller and when reporting the called subscriber controls further information about this . 4. Subscriber device according to the preamble of claim 1, characterized in that the subscriber device is connected to the telecommunications network via at least two radio channels operating in duplex mode, that the microprocessor ( MP ) holds the connection made via the one radio channel for forwarding the call, on the basis of the stored Dialing information on the other radio channel initiates a second connection and when the called subscriber reports the connection through the two radio channels, that an instruction text memory is integrated in the subscriber device and that the microprocessor ( MP ) when holding the connection provides information about the calling party and when reporting the called subscriber controls further information about this. 5. Subscriber device according to claim 1, characterized in that - for the duplex operation of the subscriber device - with the two main connecting lines ( L 1 , L 2 ) a switching device is connected. 6. Subscriber device according to claim 1, characterized in that - for duplex operation of the subscriber device - with the two main connecting lines ( L 1 , L 2 ) a hybrid circuit ( G ) is connected with or without a replica network that with the hybrid circuit ( G ) two adjustable Amplifiers ( V 1 , V 2 ) are connected and that the microprocessor ( MP ) controls the switching of the amplifier inputs. 7. Subscriber device according to claim 1, characterized in that - for the half-duplex operation of the subscriber device - with the two main connecting lines ( L 1 , L 2 ) an adjustable amplifier is connected and that the microprocessor ( MP ) controls the switching of the amplifier input.