The invention discloses a system, a method and equipment for controlling network access, and aims to solve the problem that the service quality of a mobile network can be improved only by increasing network construction cost. In the invention, service signal requiring quality assurance in a first call is transmitted by first access control equipment; and other service signals in the call except the service signal requiring the quality assurance are transmitted by second access control equipment. By the invention, different service signals in the call can be transmitted by different access control equipment, so that the service signal requiring the quality assurance can be transmitted by backhauling resources with quality assurance, other service signals without requiring the quality assurance can be transmitted by wideband backhauling resources in low cost; therefore, under the condition of not increasing network construction cost, the transmission quality of the service signal requiring the quality assurance is ensured.