227434 ⎘
Substation equipment, e.g. for use by subscribers; Devices for calling a subscriber; Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies signals generated in digital form
Mobile terminal for automatically making a telephone conversation using artificial intelligence
#2Mobile terminal
#3Access control and validation using sonic tones
#4All-digital phase locked loop (ADPLL) including a digital-to-time converter (DTC) and a sampling time-to-digital converter (TDC)
#5Audio recording system and apparatus
#6Systems and methods for content delivery and management
#7Time-to-digital converter
#8System effective to demodulate a modulated code and provide content to a user
#9Method and device for encoding characters and routing calls using expanded dual-tone multi-frequency (DTMF) encoding scheme
#10DEVICE EFFECTIVE TO MODULATE A CODE AND TO PROVIDE CONTENT TO A USER
#11System effective to demodulate a modulated code and provide content to a user
#12System effective to modulate a code and provide content to a user
#13Telephony service interaction management
#14DTMF signalling between mobile and server
#15Portable dialer device and method
#16DTMF SIGNALING IN WIRELESS COMMUNICATIONS NETWORKS
#17System and method for amplifying attenuated DTMF signals in a packet based network
#18System and method for overcoming dual tone multi frequency (DTMF) signal attenuation in analog and packet based networks
#19Mobile communication terminal having qwerty keys and method for outputting dual tone multi-frequency signal thereof
#20Method and device for secure phone banking
#21METHOD AND APPARATUS FOR PROVIDING AND USING A TELEPHONE CALLING CARD
#22Device and method for simulating a telephonic condition
#23Method for in-band entity authentication via telephone
#24DTMF tone signal transmission method and DTMF tone signal transmission system
#25Speech to DTMF conversion