Apparatus and methods for handling call waiting in a modem
US6345088B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1999 |
| Grant date | Feb 5, 2002 |
| Priority date | — |
| Expiry date | Aug 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/4281
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A modem that handles interruptions caused by call waiting signals is described. When the modem detects a call waiting signal, the modem alerts the user to the presence of the call waiting signal, and permits the user to answer the incoming call by taking a local phone that is connected to the modem off-hook. When the local phone is taken off-hook, the modem automatically generates a hook-flash signal to switch to the incoming call. When the user places the local phone back on-hook, the modem generates another hook-flash signal to resume (if possible) the modem connection. Additionally, the modem prevents a “fallback”, in which the modem switches from its current protocol to a lower-speed protocol, during a “retrain” process caused by a call waiting event.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.