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Technical Configuration MultiVOIP FXS User Guide
60
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.
IP Parameter fields
Gateway
Name
alphanumeric Descriptor of current voip unit to distinguish it from other units in
system.
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 MultiVOIP.
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 MultiVOIP to the
Internet.