07221669 is referenced by 61 patents and cites 53 patents.

An inband signaling modem communicates digital data over a voice channel of a wireless telecommunications network. An input receives digital data. An encoder converts the digital data into audio tones that synthesize frequency characteristics of human speech. The digital data is also encoded to prevent voice encoding circuitry in the telecommunications network from corrupting the synthesized audio tones representing the digital data. An output then outputs the synthesized audio tones to a voice channel of a digital wireless telecommunications network.

Title
Cellular telephone having improved in-band signaling for data communications over digital wireless telecommunications networks
Application Number
10/92661
Publication Number
7221669 (B2)
Application Date
March 6, 2002
Publication Date
May 22, 2007
Inventor
Rod L Proctor
Seattle
WA, US
Wayne Eatherly
Puyallup
WA, US
Robert Leyendecker
Aloha
OR, US
Joseph Preston
Bainbridge Island
WA, US
Dan A Preston
Bainbridge Island
WA, US
Agent
Stoel Rives
Assignee
Airbiquity
WA, US
IPC
H04B 7/216
View Original Source