Patent ID: 9143632
Filing Date: 2015-09-22
Classification: H04M,H04N

Abstract:
1. A method for signaling a facsimile pass through mode over a voice over internet protocol voice service, comprising: establishing via a pass through codec a voice over internet protocol call between a first optical network terminal associated with a sender and a second optical network terminal associated with a receiver; in response to detection of a facsimile tone at the sender, receiving a facsimile pass through notify message sent from the first optical network terminal to a server of a voice over internet protocol voice service provider, forwarding to a controller that manages call control signaling and routing for the voice over internet protocol service provider a notification of a facsimile pass through notify event, as indicated by the first optical network terminal's facsimile pass through notify message, for identification at the controller of the voice over internet protocol call as a fax call with a type pass through; receiving from the controller an acknowledgement that the controller received the notification of the facsimile pass through notify event as indicated by the first optical network terminal; forwarding the acknowledgement by the controller back to the first optical network terminal that a fax tone detect event has occurred for causing a change in a mode at the first optical network terminal to a fax call, wherein the acknowledgement by the controller triggers a notification from the first optical network terminal to the second optical network terminal for detection by the second optical network terminal of the fax tone; in response to detection of a facsimile tone at the receiver, receiving a facsimile pass through notify message sent from the second optical network terminal; forwarding to the controller that manages call control signaling and routing for the voice over internet protocol service provider a notification of a facsimile pass through notify event, as indicated by the second optical network terminal's facsimile pass through notify message, for identification at the controller of the voice over internet protocol call as a fax call with a type pass through; receiving from the controller an acknowledgement that the controller received the notification of the facsimile pass through notify event as indicated by the second optical network terminal; and forwarding the acknowledgement by the controller back to the second optical network terminal that the fax tone detect event has occurred.