Snmp; Network Assessment - Avaya 4600 Series Administrator's Manual

4600 Series IP Telephone LAN Administrator's Guide
schemes such as UDP port selection. Documentation for your LAN equipment will elaborate on
the extent your network can support any or all of these initiatives. See Chapter 4, ''Server
Administration'' for some implications of QoS for the 4600 Series IP Telephones.
In addition, DEFINITY Release 9.5 supports the capability to download certain QoS parameters
(i.e. 802.1Q, DiffServ values, and UDP port ranges) to the telephone during Registration. See
your Release 9.5 administration material for further information about this capability.

SNMP

Simple Network Management Protocol (SNMP) is a family of standards-based protocols and
procedures to allow vendor-independent management of data networks. Using a simple set of
protocol commands, an SNMP-compliant device will store information in standard format in one or
more Management Information Bases (MIBs). In general, devices will support the standards-
specific MIB termed MIB-II. In addition, devices may define one or more "custom MIBs" that
contain information about the specifics of the device.
Release 1.1 of the 4600 Series IP Telephones is fully compatible with SNMPv2c (a later version of
SNMP) and with Structure of Management Information Version 2 (SMIv2), although the telephones
will respond correctly to queries from entities that comply with earlier versions of SNMP, such as
SNMPv1. "Fully compatible" means that the telephones will respond to queries directed either at
the MIB-II or the Custom MIB. The 4600 Series IP Telephone Custom MIB is read-only (values
therein cannot be changed externally via network management tools). Similarly, although the 4600
Series IP Telephone's MIB-II has read/write permissions in accordance with the standard, to
improve security any writes to MIB-II are saved but otherwise ignored.
More information about SNMP and MIBs can be found in the IETF references listed in Chapter 1,
Related Documents. Appendix A of this LAN Administration Guide lists the Custom MIB, which is
also available for download in *.txt format on the Avaya support website.

Network Assessment

The current technology allows optimum network configurations to deliver VoIP with perceived
voice quality close to that of the Public Switched Telephone Network (PSTN). Not every network is
able to take advantage of packet voice transmissions. Some data networks have insufficient
residual capacity for even compressed voice traffic. In addition, the usual approach to developing
data networks by integrating products from many vendors makes it necessary to test the
components for compatibility with Voice over IP traffic.
It is assumed that your organization has performed a network assessment (with or without the
assistance of Avaya) before attempting to install Voice over IP, in order to have a high degree of
confidence that the existing data network has the capacity to carry voice packet traffic and is
compatible with the required technology.
A network assessment would include a determination of the following:

SNMP

2-4
2
2