sˌʌm ɑːɹ sˈɪmpəl sˈɪŋɡəljˈuːzɚ sˈɪstəmz ðæt tˈɪpɪkli ˈoʊnli ɹᵻkwˈaɪɚɹ ɐ jˈuːzɚ tʊ ɪnstˈɔːl ðə sˈɔftwɛɹ ˌɔn ðɛɹ pˌiːsˈiː, ænd jˈuːs sˌʌm tˈaɪp ʌv sˈɪmpəl ɐdˈæptɚ tə kənˈɛkt ðə pˌiːsˈiː tʊ ɐ fˈoʊn.
Some are simple single-user systems that typically only require a user to install the software on their PC, and use some type of simple adapter to connect the PC to a phone.