Operator Toll Dialing

North American telephone switching technology

en-US/ˈɑpəˌɹeɪdɚ ˈtoʊl ˈdaɪəlɪŋ/
en-GB/ˈɒpəˌɹeɪtə ˈtəʊl daɪəlɪŋ/

دسته بندی ها:

Long-distance calling