Specifications

Chapter 9 - Miscellaneous Configuration Administration Manual (SIP/MGCP Version)
AT-VP504E FXS 64
To enable the DS field configuration:
1. Locate the following attributes under the interfaceQoSGroup
of the Provisioning MIB:
• interfaceQoSSignalingDSFieldValue
• interfaceQoSMediaDSFieldValue
These variables are 1 octet scalar ranging from 0 to 255. The
DSCP default value should be 101110 for both signalling and
media packets. This results in the DS field value of:
10111000 (184d).
This default value would result in a value of “101” precedence
bits, low delay, high throughput, and normal reliability in the
legacy IP networks (RFC 791, RFC 1812). Network
managers of legacy IP networks could use the above-
mentioned values to define filters on their routers to take
advantage of priority queuing. The default value is based on
the Expedited Forwarding PHB (RFC 2598)
recommendation.
2. Set the value you want to use.
You can find references on DS field under the IETF working
group DiffServ.
For more information, please refer to the following RFC
documents and the
MIB Reference manual:
• Definition of the Differentiated Services Field (DS
Field) in the IPv4 and IPv6 Headers (RFC 2474)
• An Architecture for Differentiated Services (RFC
2475)
• Assured Forwarding PHB Group (RFC 2597)
• An Expedited Forwarding PHB (RFC 2598)