US 9,692,615 B2Granted

Facsimile passthrough silence suppression

AssigneeDialogic Corporation

InventorsMaciej Wasiel, David M. Lash

Life of this patent

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Abstract

A facsimile transmission device implements silence suppression based on a state of a facsimile call and detected facsimile signals. A decision process implemented in the facsimile device can determine when silence suppression should be enabled. The facsimile device may be an IP media gateway connected between a PSTN and an IP network, or may be an IP endpoint. The determination of when to enable silence suppression can be based on the state of sending or receiving facsimile transmissions including facsimile operations and/or signaling. The decisions can be based on the type of facsimile transmission including G3 type or SG3 type facsimile transmissions. By enabling silence suppression during facsimile transmissions, significant reductions in bandwidth requirements can be achieved for the facsimile transmission while maintaining facsimile transmission quality.

Claims20

Dependent claims

A device for processing a facsimile transmission that includes a packet switched network interface for connection to a packet switched network, comprising:

a packet handler coupled to the packet switched network interface, the packet handler being configured, during a facsimile call:
to receive facsimile data;
to generate a facsimile transmission packet containing the facsimile data;
and
to transmit the facsimile transmission packet to the packet switched network via the packet switched network interface;
and
a controller coupled to the packet handler, the controller being configured, responsive to the facsimile data and to a content of the facsimile transmission;
to determine whether the content of the facsimile transmission includes one or more of a facsimile command and training data;
and
having determined that the content of the facsimile transmission does not include one or more of the facsimile transmission command and training data, to perform a process of silence suppression, the process of silence suppression including:
determining whether the facsimile data includes silence;
and
having determined that the facsimile data includes the silence, providing a first signal to the packet handler to prevent the packet handler from one or more of generating and transmitting the facsimile transmission packet containing the silence to the packet switched networks without terminating the facsimile call, thereby reducing a bandwidth utilization on the packet switched network during the facsimile transmission,
wherein the controller is further configured, having determined that the content of the facsimile transmission includes one or more of the facsimile command and the training data, to disable the process of silence suppression.

11 more elements

A method of suppressing silence in a device for processing a facsimile transmission, the device including a packet switched network interface for connection to a packet switched network, the method comprising:

during a facsimile call, receiving (i) at a packet handler coupled to the packet switched network interface, facsimile data that is to be transmitted via the packet handler, and (ii) an indication of a content of the facsimile transmission being received from the packet switched network interface;
determining whether the content of the facsimile transmission includes one or more of a facsimile command and training data;
and
having determined that the content of the facsimile transmission does not include one or more of the facsimile transmission command and training data, performing a process of silence suppression, the process of silence suppression including:
determining whether the facsimile data includes silence;
and
having determined that the facsimile data includes the silence, providing a first signal to the packet handler to prevent the packet handler from one or more of generating and transmitting a facsimile transmission packet containing the facsimile data including the silence to the packet switched network without terminating the facsimile call, thereby reducing a bandwidth utilization on the packet switched network during the facsimile transmission;
and
having determined that the content of the facsimile transmission includes one or more of the facsimile command and the training data, to disable the process of silence suppression.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/634,335Filed 9 Dec 2009
Published: US 2011/0134914 A19 Jun 2011
Granted: 27 Jun 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H04L 12/66
Data switching networks: arrangements for connecting between networks having differing types of switching systems, e.g. gateways
H04L 65/103
Media gateways: in the network
H04N 1/00209
With a digital computer or a digital computer system, e.g. an internet server: transmitting or receiving image data, e.g. facsimile data, via a…
H04N 1/00214
Transmitting or receiving image data, e.g. facsimile data, via a computer, e.g. using e-mail, a computer network, the internet, I-fax: details of…