| Subject | English | Russian |
| media. | complementary network service | дополнительная сетевая служба (расширяющая услуги провайдера) |
| telecom. | complementary service | дополнительная услуга (oleg.vigodsky) |
| adv. | complementary services | дополнительные услуги (Services that accompany the same product or system and support its acquisition, installation, usage, maintenance, and disposal. BD Alexander Demidov) |