Ip Address Lists And Station Number Portability; Security - Avaya 4600 Series Administrator's Manual

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4600 Series IP Telephone LAN Administrator's Guide

comes support of "remote ping" and "remote traceroute." The DEFINITY switch can instruct such a

4600 Series IP Telephone to initiate a ping, or a traceroute, to a specified IP address. The

telephone will carry out that instruction and send a message to DEFINITY informing it of the

results. See DEFINITY R10 Administration information for further details.

IP Address Lists and Station Number Portability

With Release 1.5 of the 4600 Series Telephones comes the capability to specify lists of IP

addresses for key elements of the network, rather than merely one address for each. Specifically,

you can specify up to 127 total characters in each list of the following: router/gateways, TFTP

servers, and the DEFINITY call server. When the 4600 telephone is powered up or is rebooted, it

attempts to establish communication with these various network elements in turn, starting with the

first address on the respective list. If the communication is denied, or times out, the telephone

proceeds to the next address on the appropriate list and tries that one. The telephone does not

report failure unless all the addresses on a given list have failed.

Obviously, this capability can significantly improve the reliability of IP telephony by maximizing the

likelihood the telephone can communicate with backup equipment if the primary equipment is

down or inaccessible (say, perhaps due to a limited network outage).

However, this capability also has the advantage of making station number portability easier.

Assume a situation where the company has multiple locations (for example, London and New

York), all sharing a corporate IP network. Users want to take their telephones from their offices in

London and bring them to New York. When users power up their telephones in the new location,

the local DHCP server will generally route them to the local switch, which denies service because

it knows nothing about these new users. However, with proper administration of the local DHCP

server, the telephone knows to try a second call server IP address, this one in London. The user

can then be automatically registered with the London switch.

Chapter 4

contains details on administration of DCHP servers for lists of alternate call servers,

router/gateways, and TFTP servers.

In VoIP, physical wire is replaced with an IP connection. The connection is more mobile.

Unauthorized relocation of the IP telephone allows unauthorized users to send and receive calls

as the valid owner. For further details on toll fraud, refer to the DEFINITY documents in