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| Multiplexed synchronous/asynchronous data bus |
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| Logic isolator with high transient immunity |
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| Adiabatic charging logic circuit |
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Automatic call screening telecommunication device
| Details |
Inventors: Weber, Gary N.;
Assignee: Lucent Technologies, Inc. (Murray Hill, NJ)
Primary Examiner: Hong; Harry S.
Assistant Examiner: Tieu; Benny Q.
Attorney, Agent or Firm: Gibbon, del Deo, Dolan, Griffinger & Vecchione
A selective ring response device for a telecommunication line comprises: a ring tone detector circuit for detecting a special ring tone different from a standard ring tone, the ring tone detector circuit coupled to the communication line; an interface circuit capable of placing the communication line in an off-hook status and capable of selectively applying a switch hook flash signal to the communication line, the interface circuit coupled to the communication line; and a control circuit coupled to the ring tone detector circuit and the interface circuit, wherein the interface circuit places the communication line in the off-hook status, and at the user's request applies the flash hook signal to the communication line in response to the ring tone detector circuit detecting the special ring tone. |
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DETAILED DESCRIPTION OF VARIOUS ILLUSTRATIVE EMBODIMENTS While the present invention automatic call screening telecommunication device is especially well suited for switched wired networks, it is equally well suited for use in a wireless network, as well as a packet switching network, such as an ATM network.
A telecommunication central office can provide a feature whereby calls that are forwarded to another telephone number answering service, or telemessage provider, can be selectively screened by users.
Currently a user receives a special reminder tone, 20 Hz for 400-600 millisecond, and then can place the telephone line in the off-hook position.
The system can further provide a visual indication to the user that a call is being screened, such as with an LED or display.
At this point the user can monitor the call being forwarded while the calling party is unaware of their presence.
A switch hook flash signal can be sent from the user if they want to connect with the calling party, which will then make the connection and establish a three way call between the calling party, the call screening customer, and the remote party.
Otherwise the user can hang up, which terminates the screening without the knowledge of the calling party.
Referring to FIG.
1 there is shown a prior art switched communication network which employs the central office feature.
A switched telecommunications network 10 contains at least one central office switch 12.
The central office switch may contain a voice mail system 14 as well as other optional systems.
Further, the voice mail system, answer service, or telemessaging features do not have to be associated directly with the central office switch 12.
A plurality of telecommunication devices 16 are connected to the switched telecommunication network 10.
When a feature user 18 activates the central office switch 12 based feature, calls directed to the feature user 18 will be forwarded to a secondary user 20 or a central office voice mail system 14.
When a call is made from a telecommunication device 16 to the feature user 18 the central office switch 12 generates a special reminder tone (typically 20 Hz for 400-600 milliseconds in contrast to the standard ringing tone of 17 Hz to 20 Hz for 1 second) which is received by the feature user 18
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Processing Data 
