Cellular to 802.11 voice roaming utilizing SIP signaling
US7215959B2 · kind B2 · utility
31Cited by
8References
45Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 15, 2003 |
| Grant date | May 8, 2007 |
| Priority date | — |
| Expiry date | Jun 8, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W36/14
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of roaming between a cellular network and a wireless network can include receiving an invitation over the wireless network. The invitation can be sent from a mobile communications device engaged in a cellular call over a cellular voice channel. The method also can include authenticating the mobile communications device over the wireless network, sending an acknowledgement of the invitation to the mobile communications device over the wireless network, and initiating a handoff. The established cellular call can be switched from the cellular network to the wireless network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.