Ebipụtala ederede isi mmalite nke ọrụ D-Modem, nke na-emejuputa modem ngwanrọ maka ịhazi nnyefe data na netwọk VoIP dabere na usoro SIP. D-Modem na-eme ka o kwe omume ịmepụta ọwa nkwukọrịta n'elu VoIP, dị ka otu modems omenala siri kwe ka ebufe data na netwọk ekwentị. Mpaghara ngwa maka ọrụ a gụnyere ijikọ na netwọk dialup dị ugbu a na-ejighi netwọk ekwentị n'akụkụ nke ọzọ, ịhazi ọwa nkwukọrịta zoro ezo, na ime nnwale nchekwa nke sistemu enwere naanị site na dialup. Edere koodu ọrụ ahụ n'asụsụ C wee kesaa n'okpuru ikike GPLv2.