Method and apparatus for interworking dissimilar text phone protocols over a packet switched network
US7792143B1 · kind B1 · utility
2Cited by
69References
31Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2005 |
| Grant date | Sep 7, 2010 |
| Priority date | — |
| Expiry date | Dec 26, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M7/125
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication scheme allows two Voice Over Internet Protocol (VoIP) gateways that do not necessarily support a common set of Public Switched Telephone Network (PSTN) text terminal (TTY) modulations and which are communicating with dissimilar PSTN text terminal devices to negotiate a transition to text relay mode thus allowing those dissimilar PSTN text terminal devices to interwork with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.