The DCME's functionality, from the point of view of the telephone switch attached to its local interface, is standardised by ITU-T Recommendation Q.50.
ðə dˌiːsˌiːˌɛmˈiː fˌʌŋkʃənˈælᵻɾi, fɹʌmðə pˈɔɪnt ʌv vjˈuː ʌvðə tˈɛlᵻfˌoʊn swˈɪtʃ ɐtˈætʃt tʊ ɪts lˈoʊkəl ˈɪntɚfˌeɪs, ɪz stˈændɚdˌaɪzd baɪ ˌaɪtˌiːjˈuːtˈiː ɹˌɛkəmɛndˈeɪʃən kjˈuː.fˈɪfti.