Welltech LP-201 Mar-11-2005 - Manual (Page 38)

SIP SIP-Phone Administration Guide
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9. DSCP Configuration
Please refer to chapter 4.16 [tos] command
Set Signal or RTP Packet DSCP value:
- Assured Forwarding (AF) PHB: Select Delay priority and Drop Precedence
- Expedited Forwarding (EF) PHB: Select TOS value as EF
- Default: Select TOS value as 0
- User Assign Special DSCP Code: User can set other unspecified value here.
TOS/DiffServ (DS) priority function can discriminate the Differentiated Service Code
Point (DSCP) of the DS field in the IP packet header, and map each Code Point to a
corresponding egress traffic priority. As per the definition in RFC2474, the DS field is
Type-of-Service (TOS) octet in IPv4. The recommended DiffServ Code Point is defined
in RFC2597 to classify the traffic into different service classes. The mapping of Code
Point value of DS-field to egress traffic priorities is shown as follows.