Method and system for detecting facsimile communication during a VoIP session
US7545818B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2003 |
| Grant date | Jun 9, 2009 |
| Priority date | — |
| Expiry date | Mar 27, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L65/104
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
According to one aspect, a method of switching a first gateway from a voice mode to a facsimile mode comprises: configuring the first gateway to the voice mode for communication with a second gateway over a packet network, receiving a plurality of data packets from the second gateway over the packet network, analyzing one or more of the plurality of data packets, such as UDP packets, and configuring the first gateway to the facsimile mode if the analyzing determines that the one or more of the plurality of data packets carry facsimile data packets. The analyzing may include calculating a length of the UDP payload in accordance with UDPTL packet structure, and deciding the UDP payload includes a UDPTL packet if the calculated length is equal to UDP payload length, as indicated in the UDP header.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.