touch-tone calling

Digital Selective Calling Digital Selective Calling

ranging tone multi-tone ranging

Semi tone、Whole tone

The Tone Combination of Double-tone Serial Bell

tone frequency of tone pulse

Tone-on-Tone

Tone-on-Tone Dyeing

tone-on-tone effect

12319 calling center of urban construction

abbreviated address calling

Account Card Calling

Account Card Calling ACC

Additional Calling Party Number

Album of Calling for Small Houses

all number calling

all numbers calling

all-number calling

all-number calling (ANC)