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US 5,513,251 AGranted
Method for providing call waiting service
AssigneeAT&T Corp.
InventorsMark M. Rochkind, Lee B. Strahs
Life of this patent
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AssigneeAT&T Corp.
InventorsMark M. Rochkind, Lee B. Strahs
Estimating the term…
The disruption on the data channel caused by use of the conventional call waiting feature with simultaneous voice/data (SVD) modems, when the data channel is active, is overcome by employing SVD modems in the public switched telephone network and supplying the call waiting signal over only one of the channels made available by such an SVD modem. In an exemplary embodiment of the invention, the call waiting signal from the public switched telephone network is supplied by coupling it into the network side of the SVD modems that are provisioned in the public switched telephone network for providing simultaneous voice and data service. Advantageously, a data call that is in progress will not be disturbed by the coupling of an audible signal into the voice channel. Also, since the connection between the user's local SVD modem and the SVD modem in the network to which he is connected can be maintained while changing the source of the data that is coupled to the SVD modem on the network side, it is possible to implement a "data call waiting" feature as well. Moreover, the fact that a voice call is waiting may be signaled over the voice channel or the data channel and, likewise, the fact that a data call is waiting may be signaled over the voice channel or the data channel.
A method for use in a public switched network having a simultaneous voice/data (SVD) modem, comprising the steps of:
A method for use in a public switched network having a simultaneous voice/data (SVD) modem that can simultaneously carry a voice and data channel in a single POTS channel, comprising the steps of:
A method for use in a public switched network having a simultaneous voice/data (SVD) modem, comprising the steps of:
A method for use in a public switched network having a simultaneous voice/data (SVD) modem, comprising the steps of:
A method for communicating the existence of an incoming call to a called party, the method comprising the step of:
A method for use in a public switched network having a simultaneous voice/data (SVD) modem that can simultaneously carry a voice and data channel in a single POTS channel, said SVD modem being used by a subscriber having an SVD modem whose telephone line is already in use on a first call using a first of the two SVD modem channels to a first destination, the method comprising the steps of:
Dependencies are inferred from the claim text.