![](/images/new-backgrounds/1172304/172304245x1.webp)
3.7.7 QoS
This Quality of Service (QoS) function is only for the VoIP feature. When this function is enabled, the Vigor 3300 Series will set rate limitation for incoming and outgoing transmissions to ensure the best quality of service in VoIP.
Disable | Click this button to disable QoS function. The voice quality |
| cannot be quaranteed and the data throughput will be higher. |
Enable | Click this button to invoke QoS function. The voice quality can |
| be good and the data throughput will be lower. |
Link Fragmentation and | Each packet size is determined by the bandwidth of WAN |
Interleaving | interface. The smaller the bandwidth is, the smaller the packet |
| will be. Such activity can reduce the time delay of packet |
| transmitting. Meanwhile, the VoIP packets will be inserted in |
| the front of queue of signal for transmitting quickly and |
| obtaining best audio quality. Please check this box to invoke |
| this function (shrinking the packet for fast sending). |
Vigor3300 Series User’s Guide | 119 |