User`s manual

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Symmetric Response Routing. This behavior is not desirable in many cases.
Please configure it according to your service provider.
4.4.7 Other Settings
User can set up the Hold by RFC, Voice/SIP QoS and SIP expire time in this
page.
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Parameter Description
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Hold by RFC Enable or disable
Voice QoS (1-63) Assign a specific value for the first 6 bits of the IP ToS/DS
(DiffServ) field in the Voice (RTP) packet header.
SIP QoS (1-63) Assign a specific value for the first 6 bits of the IP ToS/DS
(DiffServ) field in the Voice (RTP) packet header.
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NOTE:
● The function can discriminate the IP DSCP of the DS field in the IP packet header,
and map each Code Point to a corresponding egress traffic priority.
● Junction devices (switch or router), within a converged network of voice and data,
should support TOS / DiffServ to identify and prioritize voice traffic (QoS higher
than 0) over others (QoS= 0).
● Setting Voice/SIP QoS as 46, voice is transmitted to Internet in the service class of