Multitech MVP100GK Guía de usuario descargar pdf (Pagina 55)

Chapter 5 – Gatekeeper Software

Multi-Tech Systems, Inc. MultiVOIP Gatekeeper User Guide 55

IP Parameter Definitions

Field Name Values Description

Diff Serv Parameter

fields

Diff Serv PHB (Per Hop Behavior) values pertain

to a differential prioritizing system for IP packets

as handled by Diff Serv-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 Diff Serv, configure both fields to 0

decimal.

The next page explains Diff Serv 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

Value is used to prioritize the

RTP/RTCP audio IP packets.

Frame Type Type II,

SNAP

Must be set to match network’s

frame type. Default is Type II.

The IP Datagram with Header, Its Type-of-Service Field, & DiffServ

bits =>

0 4 8 16 19 24 31

VERS HLEN

TYPE OF

SERVICE

TOTAL LENGTH

IDENTIFICATION FLAGS FRAGMENT OFFSET

TIME TO LIVE PROTOCOL HEADER CHECKSUM

SOURCE IP ADDRESS

DESTINATION IP ADDRESS

IP OPTIONS (if any)

PADDING …

end of header

DATA

…

The TOS field consists of eight bits, of which only the first six are used. These six bits are called the

“Differentiated Service Codepoint” or DSCP bits.

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 90 91

Comentarios a estos manuales

Sin comentarios

Multitech MVP100GK Guía de usuario Pagina 55

Comentarios a estos manuales

Relacionado con productos y manuales para Gateways / Controladores Multitech MVP100GK