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Chapter 4: Configuring your MVPGSM
Multi-Tech Systems, Inc. MVPGSM 28
Ethernet/IP Parameter Definitions (continued)
Field Name Values Description
Dif
f
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.
Call Control
PHB
0
–
63
default = 34
Value is used to prioritize call setup IP packets.
Setting this parameter to 0, in conjunction with VOIP Media PHB below will disable
Diff Serv.
VOIP Media
PHB
0
–
63
default = 46
Value is used to prioritize the RTP/RTCP audio IP packets.
Setting this parameter to 0, in conjunction with Call Control PHB above will disable
Diff Serv.
FTP Parameter fields
FTP Server
Enable
Y/N
Default =
disabled
See “FTP
Server File
Transfers” in
Chapter 6
MultiVOIP GSM unit has an FTP Server function so that firmware and other
important operating software files can be transferred to the VOIP via the network.
DNS Parameter fields
Enable DNS Y/N
Default =
disabled
Enables Domain Name System function where computer names are resolved using
a worldwide distributed database.
Enable SRV Y/N Enables ‘service record’ function. Service record is a category of data in the
Internet Domain Name System specifying information on available servers for a
specific protocol and domain, as defined in RFC 2782. Newer internet protocols like
SIP, STUN, H.323, POP3, and XMPP may require SRV support from clients. Client
implementations of older protocols, like LDAP and SMTP, may have been enhanced
in some settings to support SRV.
DNS Server IP
Address
n.n.n.n IP address of specific DNS server to be used to resolve Internet computer names.