How to guarantee the high quality of business network, the key point is the use of service quality (QoS) VoIP call quality in the acceptable range, must implement the necessary in VoIP network service quality assurance features to control the VoIP packets in the transmission of packet loss, delay and jitter, QoS implementation can have several ways, in call server or gateway implementation call access control, the congestion is expected to happen when the initiative to limit the number of calls, to ensure that the access to call you can get good service,
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