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QoS Settings
QoS cannot guarantee 100% audio quality. Theoretically when requested bandwidth is more
than actual bandwidth, the audio quality will be compromised. QoS only have guaranteed-priority to
send out the voice packet, but cannot guarantee the remote device can receive and play the audio
successfully. In addition, Qos cannot choose and request which downloaded packet to receive (in
priority). For priority options, ToS/DSCP must be activated.
Note: Not all routers are equipped with ToS/DSCP, if not, the remote VoIP devices cannot
receive the audio packets with priority.
Advanced Settings
→
QoS
Enable WAN QoS: Check the box to guaranty the voice quality. Voice packets have the highest
priority in IP networks, and the data transmission is distributed to less bandwidth.
ToS IP Precedence / DiffServ (DSCP):
After activated, the transmitting device will cooperate
outer Switch/Router to send the audio packet with priority; the system will set up Precedence
peremter at TOS or DSCP peremeter at DS. The priority is more supreme if the paremeter is
higher. The peremeter of Signaling (SIP Signal) and Voice (RTP) can be set up individually.
ToS IP Precedence: Select the precedence for signaling (data) and voice (voice data).
DiffServ (DSCP): Select the number of signaling (data) and voice (voice data) values.
Note: For the VoIP, ToS IP Precedence and DiffServ are the same function. You only select one
for priority marking.