Method and apparatus for DTMF signaling on compressed voice networks
US6385192B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1998 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Mar 24, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S379/90
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of transmitting DTMF signals over a compressed computer network comprises sending a packet containing a compressed DTMF signal followed by a confirmation packet. The confirmation packet preferably comprises an uncompressed DTMF signal. To detect the DTMF signal transmitted, a telephony Internet server decompresses packets as they are received. If a packet appears to contain a compressed DTMF signal, the telephony Internet server looks for the presence of the confirmation packet before processing the previously received packet as a DTMF signal. In another embodiment, an output of a speech compressor and a DTMF signal detector are transmitted on separate virtual channels of a real time protocol data stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.