ˌʌndɚ hˈɛvi lˈoʊdɪŋ kəndˈɪʃənz, fɔːɹ ɛɡzˈæmpəl wɛn ɐ lˈɑːɹdʒ nˈʌmbɚɹ ʌv tʃˈænəlz ʃˈoʊ kəntˈɪnjuːəs æktˈɪvᵻɾi dˈuː tə vˈɔɪsbænd dˈeɪɾə ɔːɹ ɡɹˈuːp ɹˌoʊmən θɹˈiː fæksˈɪmɪli sˈɪɡnəlz, ðə vˈɔɪs ɪntˌɜːpəlˈeɪʃən mˈeɪ nˌɑːt biː ˈeɪbəl tʊ ˈɑːpɚɹˌeɪt wɪðˌɪn ɐ sˌæɾɪsfˈæktɚɹi kwˈɔlᵻɾi ɹˈeɪndʒ dɪskəntˈɪnjuːəs sˈɪɡnəlz sˈʌtʃ ɐz spˈiːtʃ bˌiːɪŋ ɐfˈɛktᵻd baɪ kəmpˈɛɾᵻtˌɪv klˈɪpɪŋ ʌvðɪ ɪnˈɪʃəl pˈɑːɹt ʌvðɪ æktˈɪvᵻɾi.
Under heavy loading conditions, for example when a large number of channels show continuous activity due to voiceband data or Group III facsimile signals, the voice interpolation may not be able to operate within a satisfactory quality range – discontinuous signals such as speech being affected by competitive clipping of the initial part of the activity.