An buga rubutun tushen aikin D-Modem, wanda ke aiwatar da modem na software don tsara watsa bayanai akan hanyoyin sadarwar VoIP bisa ka'idar SIP. D-Modem yana ba da damar ƙirƙirar tashar sadarwa akan VoIP, kwatankwacin yadda modem ɗin kiran waya na gargajiya ya ba da izinin canja wurin bayanai ta hanyar sadarwar tarho. Yankunan aikace-aikacen aikin sun haɗa da haɗawa da cibiyoyin sadarwar dialup ɗin da ake da su ba tare da amfani da hanyar sadarwar tarho a ɗayan ƙarshen ba, tsara hanyoyin sadarwa a ɓoye, da gudanar da gwajin tsaro na tsarin da ake samun damar ta hanyar bugawa kawai. An rubuta lambar aikin cikin harshen C kuma an rarraba ta ƙarƙashin lasisin GPLv2.