Method and apparatus for automatically switching between pulse c

Method and apparatus for controlling a computer to implement...

Method and apparatus for controlling the ring volume of a teleph

Method and apparatus for converting frequency signals representi

Method and apparatus for customizing an audio file in a...

Method and apparatus for decoding DTMF tones

Method and apparatus for defeating a predictive telemarketing sy

Method and apparatus for detecting added keyboard functions

Method and apparatus for detecting an activation tone

Method and apparatus for detecting control signals

Method and apparatus for detecting dual tone alerting signal...

Method and apparatus for detecting multiple telephone...

Method and apparatus for detecting reception of a tone signal

Method and apparatus for detection of a telephone CPE...

Method and apparatus for determining when a telephone handset is

Method and apparatus for displaying an electronic phonebook

Method and apparatus for DTMF detection

Method and apparatus for DTMF detection and voice mixing in...

Method and apparatus for dynamic abbreviated dialing assignment

Method and apparatus for electronically detecting speech and ton