Chapter 5 – Gatekeeper Software
Multi-Tech Systems, Inc. MultiVOIP Gatekeeper User Guide
56
The Type of Service or “TOS” field
0
1
2
3
4
5
6
7
PRECEDENCE
D
T
R
unused
The three precedence have eight values, 0-7, ranging from “normal” precedence (value of 0) to “network control”
(value of 7). When set, the D bit requests low delay, the T bit requests high throughput, and the R bit requests
high reliability.
Routers that support DiffServ can examine the six DSCP bits and prioritize the packet based on the DSCP value.
The Diff Serv Parameters fields in the IP Parameters screen allow you to configure the DSCP bits to values
supported by the router. Specifically, the Voip Media PHB field relates to the prioritizing of audio packets (RTP
and RTCP packets) and the Call Control PHB field relates to the prioritzing of non-audio packets (packets
concerning call set-up and tear-down, Gatekeeper registration, etc.).
The Call Control PHB parameter defaults to 34 decimal (22 hex; 100010 binary – consider vis-à-vis TOS field
above) for Assured Forwarding behavior. The Voip Media PHB parameter defaults to the value 46 decimal (2E
hex; 101110 binary – consider vis-à-vis TOS field above). To disable Diff Serv, configure both fields to 0 decimal.
IP Parameter Definitions (cont’d)
Field Name
Values
Description
IP Parameter fields
Enable DHCP
Y/N
disabled by
default
Dynamic Host Configuration Protocol
is a method for assigning IP address
and other IP parameters to computers
on the IP network in a single message
with great flexibility. IP addresses
can be static or temporary depending
on the needs of the computer.
IP Address
4-places, 0-255
The unique LAN IP address assigned
to the Gatekeeper.
IP Mask
4-places, 0-255
Subnetwork address that allows for
sharing of IP addresses within a LAN.
Gateway
4-places, 0-255
The IP address of the device that
connects your Gatekeeper to the
Internet.
DNS Parameter fields
Enable DNS
Y/N
Enables Domain Name
Space/System function where
computer names are resolved using a
worldwide distributed database.
DNS Server IP
Address
4-places, 0-255.
IP address of specific DNS server to
be used to resolve Internet computer
names.
FTP Parameter fields
FTP Server
Enable
Y/N
Gatekeeper unit has an FTP Server
function so that firmware and other
important operating software files can
be transferred to the Gatekeeper via
the network.
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