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Signal-processing method and system for off-hook notification
| Details |
Inventors: Shaffer, Shmuel; Beyda, William J.;
Assignee: Siemens Information and Communications Networks, Inc. (Boca Raton, FL)
Primary Examiner: Smith; Creighton
Assistant Examiner:
Attorney, Agent or Firm:
A signal-processing method and system for a telecommunications switch that supports a number of individually addressable telephones including transmitting ring signals to telephones that are determined to be in an inadvertent off-hook condition. The telecommunications switch is configured to transmit a first notification ring signal upon detecting that a particular telecommunications line is in a condition that indicates that the associated telephone is in the inadvertent off-hook condition. The first ring signal induces a ring condition that preferably is uniquely identifiable as indicating that the phone has been left off-hook. A second notification ring signal is transmitted if the phone is returned to the on-hook condition and an incoming call is directed to the telephone. Preferably, the second ring signal induces a uniquely identifiable ring condition indicating that an incoming call is directed to an off-hook telephone. Optionally, a third off-hook notification signal may be transmitted to the phone to generate an audible alert by means of a speaker in the earpiece of the telephone. |
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DETAILED DESCRIPTION A telecommunications-wide system implements a signal-processing method at a telecommunications switch level.
The telecommunications lines that connect the switch to individually addressable telephones are monitored to detect the existence of preselected conditions along the telecommunications lines.
If a preselected condition is satisfied, an inadvertent off-hook event is presumed for the telecommunications line.
In response to detection that a presumed inadvertent off-hook event exists, the telecommunications switch transmits ring signals, i.
e.
, signals which induce ringing at the off-hook telephone.
While not critical, the preferred embodiment includes first and second ring signals.
The first ring signal is an off-hook notification signal that is directly triggered by the detection of the preselected condition along the telecommunications line associated with the telephone.
The first ring signal is intended to alert a person of the condition.
The first ring signal is limited to a set period of time, so that network resources are conserved if a person is not within hearing distance of the telephone.
The telecommunications line is tagged as having an off-hook status until the phone is returned to the on-hook position.
The second ring signal is a call-notification signal that is transmitted when the telecommunications line is assigned the off-hook status and an incoming call is directed to the associated phone.
Thus, the user of the telephone is alerted to incoming calls during inadvertent off-hook events.
In the preferred embodiment, the first and second ring signals are distinctive.
That is, each of the first and second ring signals induces a unique ring condition at the phone.
The distinction may be with respect to a ring cadence, volume, or both.
A "ring" is defined as including any of the sounds or other indications that are implemented at telephones to notify persons of an incoming call.
Such sounds may be generated by bells, tone generators, vibrational devices, and other indicators
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Ring Tones 
