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Installation Guide

Protected Network Core

6.0 Avaya Wireless Telephones and Subnets

Subnets are used to create a boundary between network segments. Although these boundaries are

logical, they become like a physical boundary for mobile network devices moving throughout the

enterprise. When a device with an established IP data stream (such as with an active phone call)

attempts to roam across a subnet boundary, it must obtain a valid IP address within the new subnet.

During this process, the data stream cannot be re-established automatically and the connection (voice

call) is dropped. In the case of the Avaya wireless telephones, the handsets should be power cycled to

obtain a new DHCP address. The handsets can automatically recover in the new subnet from a lost

network connection with the original subnet, but the 40-second failure and recovery time generally

warrants cycling the power.

Some APs, Ethernet switches and third-party devices have implemented methods to facilitate subnet

roaming. While these methods are transparent to the client device and are fundamentally a good

approach to accommodating multiple subnets, they often cause enough delay and jitter to manifest

poor voice quality and the tradeoffs might make such solutions unattractive for voice applications.

Since the push-to-talk feature of the Avaya 3626 and 3645 wireless telephones use multicast IP

packets, a PTT call will generally be isolated to a single subnet.

There are additional subnet requirements for Avaya wireless telephones based on the infrastructure

components that are used.

6.1 Subnets and IP Telephony Server Interfaces

The AVPP can be placed on a separate subnet from either the APs or Avaya IP telephony server. The

Avaya wireless telephones will find the AVPP and IP telephony server on another subnet through the

default gateway (router) configured in the handset or DHCP server.

Octiober 2008

VPN Concentrator

Deploying Avaya wireless telephones with a VPN

Avaya Voice

Priority

Processor

Unprotected Network

Avaya Wireless

telephones

Devices that require

access to the

network core utilize

a secure VPN

connection (dashed

line).