Avaya 3645 Manuale di installazione - Pagina 16

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Avaya 3645 Manuale di installazione
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).
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