Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent
1998-01-15
2000-07-11
Hong, Harry S.
Telephonic communications
Centralized switching system
With generating of call associated substation signal
379201, 379252, 379257, 379372, H04M 300, H04M 342, H04M 100
Patent
active
060884401
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The present invention relates to telephone exchanges and more particularly to audible signals to be transmitted by the exchange to a subscriber line to indicate exchange or network conditions, e.g. that dialling is possible and to indicate an attempt to establish a desired connection.
SUMMARY OF THE INVENTION
U.S. Pat. No. 4,510,349 describes a system in which advertising or another type of message may be routed to the line of a subscriber making a call during the periods in which call progress signals such as dial tone would normally be present.
In U.S. Pat. No. 4,941,167, an information message may be routed to the line of a calling subscriber in the event that a call to a particular called subscriber line is unsuccessful, the information message having been selected or recorded by the particular called subscriber.
International patent application WO 93/00763 describes a telephone marketing system in which a pre-recorded announcement may be played to a calling subscriber in place of at least a portion of a call progress signal, ringing tone or engaged tone in particular.
UK patent application GB 2,206,265 describes a telephone toll service in which a calling subscriber may elect to hear advertisement messages while his call to a called subscriber line is being established, in return for a lower call tariff. Call processing may be suspended at the caller's local exchange until termination of the advertisement message(s).
According to one aspect of the present invention there is provided a telephone exchange comprising: connected to the exchange, a store location for containing a code word identifying one of a plurality of audio sources; to interrogate the corresponding store location and to route to the subscriber line the corresponding audio source to indicate that dialling is possible; subscriber line to change the code word in the corresponding store location so as to change the audio source to be selected for subsequent off-hook conditions of that subscriber without otherwise changing the response of the exchange to that subscriber.
According to another aspect of the invention there is provided a telephone exchange having: connected to the exchange, a store location for containing a code word identifying one of a plurality of audio sources; of a call from a subscriber line connected to the exchange to another subscriber line to which a call is to be made and in response thereto to interrogate the store means corresponding to the calling subscriber line and to route to the calling subscriber line the audio source identified by the code word therein; subscriber line to change the code word in the corresponding store location so as to change the audio source to be selected for subsequent call attempts by that subscriber.
In a preferred arrangement the control means are operable following the receipt from the calling subscriber line of dialled digits corresponding to the subscriber line to which a call is to be made to store the dialled digits, the said condition being the storage of the dialled digits, and the control means are further operable, in response to the termination of signals from the audio source or the earlier presence or absence of a coded accept/reject signal from the calling subscriber line, to release the stored dialled digits for setting up of the call.
In a further aspect the invention provides a telephone exchange having control means operable following the receipt from a subscriber line of dialled digits for the setting up of a call to a called subscriber line: acknowledge receipt of the digits; instructing it to refrain from applying ringing current to the called subscriber line; routing of a call from the calling subscriber line to the called subscriber line and thereupon, in response to the termination of signals from the audio source or the earlier presence or absence of a coded accept/reject signal from the calling subscriber line, to send to the exchange of the called subscriber line a signal to release the application o
REFERENCES:
patent: 4510349 (1985-04-01), Segre-Amar
patent: 4856055 (1989-08-01), Schwartz
patent: 4941167 (1990-07-01), Cannalte et al.
patent: 5200994 (1993-04-01), Sasano et al.
patent: 5220599 (1993-06-01), Sasano et al.
patent: 5329578 (1994-07-01), Brennan et al.
patent: 5598461 (1997-01-01), Greenberg
Carpenter Robert BP
Millar Paul C
British Telecommunications public limited company
Hong Harry S.
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