Multi-Tech Systems MVPFX2-2 - Manual (Page 64)

Technical Configuration MultiVOIP FX User Guide
64
The IP Parameters fields are described in the tables and text passages below. Note that both DiffServ
parameters (Call Control PHB and VoIP Media PHB) must be set to zero if you enable Packet Prioritization
(802.1p). Nonzero DiffServ values negate the prioritization scheme.
IP Parameter Definitions
Field Name Values Description
Ethernet Parameters
Frame Type Type II, SNAP Must be set to match
network’s frame type.
Default is Type II.
DiffServ
Parameter
fields DiffServ PHB (Per Hop Behavior) values
pertain to a differential prioritizing
system for IP packets as handled by
DiffServ-compatible routers. There are 64
values, each with an elaborate technical
description. These descriptions are found in
TCP/IP standards RFC2474, RFC2597, and,
for present purposes, in RFC3246, which
describes the value 34 (34 decimal; 22 hex) for
Assured Forwarding behavior (default for
Call Control PHB) and the value 46 (46
decimal; 2E hexadecimal) for Expedited
Forwarding behavior (default for Voip Media
PHB). Before using values other than these
default values of 34 and 46, consult these
standards documents and/or a qualified IP
telecommunications engineer.
To disable DiffServ, configure both fields to 0
decimal.
The passage following this table explains
DiffServ in the context of the IP datagram.
Call Control
PHB 0 – 63
default = 34
. Value is used to
prioritize call setup IP
packets.
Voip Media
PHB 0 – 63
default = 46
n Value is used to
prioritize the RTP/RTCP
audio IP packets.