SpectraLink SL8440 Quick reference guide

721-0048-000 Rev: B
February 2018
Spectralink 84-Series Wireless Telephone
Deployment Guide
Using Spectralink CMS
Spectralink Software Versions 5.4 and above

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Copyright Notice
© 2017-2018 Spectralink Corporation All rights reserved. SpectralinkTM, the Spectralink logo and the
names and marks associated with Spectralink’s products are trademarks and/or service marks of
Spectralink Corporation and are common law marks in the United States and various other countries. All
other trademarks are property of their respective owners. No portion hereof may be reproduced or
transmitted in any form or by any means, for any purpose other than the recipient’s personal use, without
the express written permission of Spectralink.
All rights reserved under the International and pan-American Copyright Conventions. No part of this
manual, or the software described herein, may be reproduced or transmitted in any form or by any
means, or translated into another language or format, in whole or in part, without the express written
permission of Spectralink Corporation.
Do not remove (or allow any third party to remove) any product identification, copyright or other notices.
Notice
Spectralink Corporation has prepared this document for use by Spectralink personnel and customers.
The drawings and specifications contained herein are the property of Spectralink and shall be neither
reproduced in whole or in part without the prior written approval of Spectralink, nor be implied to grant any
license to make, use, or sell equipment manufactured in accordance herewith.
Spectralink reserves the right to make changes in specifications and other information contained in this
document without prior notice, and the reader should in all cases consult Spectralink to determine
whether any such changes have been made.
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INCLUDING BUT NOT LIMITED TO STATEMENTS REGARDING CAPACITY, RESPONSE-TIME
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HEREIN SHALL BE DEEMED TO BE A WARRANTY BY SPECTRALINK FOR ANY PURPOSE, OR
GIVE RISE TO ANY LIABILITY OF SPECTRALINK WHATSOEVER.
Warranty
The Product Warranty and Software License and Warranty and other support documents are available at
http://support.spectralink.com.
Contact Information
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[phone] [phone] [phone]
Spectralink Corporation Spectralink Europe ApS Spectralink Europe UK
2560 55th Street Bygholm Soepark 21 E Stuen 329 Bracknell, Doncastle Road
Boulder, CO 80301 8700 Horsens Bracknell, Berkshire, RG12 8PE
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[e-mail] [e-mail] [e-mail]

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Contents
Introduction...................................................................... 6
How does CMS Facilitate Deployment? .......................................................................... 6
What You Need to Know................................................................................................... 6
Recommended Software Tools........................................................................................ 6
XML editor.................................................................................................................... 6
Release Notes ............................................................................................................. 7
Product Support ............................................................................................................... 7
Spectralink References .................................................................................................... 7
Specific Documents ..................................................................................................... 8
White Papers ............................................................................................................... 9
Conventions Used in This Guide..................................................................................... 9
Icons............................................................................................................................ 9
Typography.................................................................................................................10
Part I: Getting Started ...................................... 12
Chapter 1: Infrastructure..................................................... 13
Network Components......................................................................................................13
Recommended Reading..................................................................................................13
Quality of Service.............................................................................................................14
WLAN Security.................................................................................................................14
Security Methods ........................................................................................................14
System Diagram...............................................................................................................16
System Requirements .....................................................................................................17
System Components.......................................................................................................17
Spectralink 84-Series handsets...................................................................................17
Servers .......................................................................................................................18
Access points..............................................................................................................19
Ethernet switch ...........................................................................................................20
Chapter 2: Designing the Configuration.................................. 21
QNC Settings....................................................................................................................21
Wi-Fi Setup.................................................................................................................21
Server settings............................................................................................................21
Phone Settings............................................................................................................22
Handset Usage Scenarios...............................................................................................22
Enterprise Settings..........................................................................................................23
Logging.......................................................................................................................23

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SIP Registration..........................................................................................................23
Wireless......................................................................................................................23
Mostly Enterprise Settings..............................................................................................24
Feature Config............................................................................................................24
Tones..........................................................................................................................24
Enhanced Feature Keys..............................................................................................24
Group or Enterprise Settings..........................................................................................24
Personal Alarm ...........................................................................................................24
PTT.............................................................................................................................24
Web App.....................................................................................................................24
Device Settings................................................................................................................25
Device settings............................................................................................................26
Chapter 3: Deployment Summaries ....................................... 27
Green Field Deployment..................................................................................................27
High Level Overview...................................................................................................27
DETAILED STEPS......................................................................................................28
Step #1 Unpack Phones & Charge Batteries...............................................................28
Step #2 Install Spectralink CMS on Spectralink Local Host.........................................28
Step #3 Build SIP Configuration..................................................................................33
Step #4 84-Series SW Update, CMS Configuration & Initial Provisioning via QNC......33
Test Features and Make Calls… Done!.......................................................................36
Existing 84-Series Deployment with Provisioning Server ............................................37
High Level Overview...................................................................................................37
DETAILED STEPS......................................................................................................37
Step #1 Update 84-Series SW to R 5.4.x or newer......................................................37
Step #2 Install Spectralink CMS on Spectralink Local Host.........................................37
Step #3 Build SIP Configuration..................................................................................43
Test Features and Make Calls… Done!.......................................................................46
Existing 84-Series Deployment w/o Provisioning Server..............................................47
High Level Overview...................................................................................................47
DETAILED STEPS......................................................................................................47
Step #1 Install Spectralink CMS on Spectralink Local Host.........................................47
Step #2 Build SIP Configuration..................................................................................53
Step #3 84-Series SW Update, CMS Configuration & Initial Provisioning via QNC......53
Test Features and Make Calls… Done!.......................................................................56
Part II: Configuration Details.............................. 57
Chapter 4: Create the Batch Configuration File......................... 58
Listing Handsets/Users for Batch Deployment ............................................................58

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Chapter 5: Wireless Settings using QNC................................. 60
Initial wireless provisioning..........................................................................................60
Chapter 6: Use CMS........................................................... 62
Approve the Handsets.....................................................................................................62
Chapter 7: Configure Remaining Enterprise Settings ................. 64
Chapter 8: Configure Group Settings ..................................... 65
Chapter 9: Configure Custom Settings ................................... 68
Import Configuration Files ..............................................................................................68
Create Configuration Files..............................................................................................69
Chapter 10: Testing the Handsets ......................................... 71
Test Configured Features................................................................................................71
Part III: Appendices ......................................... 72
Appendix A: Software Copyrights and Open Source Information .. 73
Software Copyright..........................................................................................................73
OFFER for Source for GPL and LGPL Software ............................................................73
Contact Information for Requesting Source Code .......................................................74
Appendix B: Spectralink Certificates...................................... 75

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Introduction
This guide introduces the requirements for provisioning the Spectralink 84-Series Wireless
Telephones using Spectralink’s Configuration Management System.
How does CMS Facilitate Deployment?
The Spectralink 84-Series handset is a powerful device with thousands of possible settings.
Spectralink’s Configuration Management System provides a GUI interface so that you can
configure only the settings you need for your deployment. Then the GUI allows you to manage
the phones easily by providing information about deployment, usage, locations, battery usage,
etc
However, CMS cannot provide every possible parameter and so it provides a Custom Settings
page to allow you to refine the deployment with your own xml files for a highly customized
installation.
What You Need to Know
This guide assumes you are familiar with:
•Computer networking and driver administration for your operating system
•An XML editor
•Wireless client administration
•WLAN infrastructure parameters and equipment
•Your phone system and how to add SIP telephones extensions to it
Admin Tip: Microsoft Lync becomes Microsoft Skype for Business (SfB)
Microsoft has re-branded its software products formerly sold under the Lync name
to Skype for Business. In this document, the names are used interchangeably.
Recommended Software Tools
XML editor
In order to view, edit and create custom xml files, you will need to use an XML editor.

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Release Notes
Every software release is accompanied by release notes that provide the new and changed
features and resolved issues in the latest version of the software. Please review these for the
most current information about your software.
Product Support
Spectralink wants you to have a successful installation. If you have questions please contact the
Customer Support Hotline at 1-800-775-5330.
The hotline is open Monday through Friday, 6 a.m. to 6 p.m. Mountain time.
For Technical Support: mailto:[e-mail]
For Knowledge Base: http://support.spectralink.com
For Return Material Authorization: mailto:[e-mail]
Spectralink References
All Spectralink documents are available at http://support.spectralink.com.
To go to a specific product page:
Select the Product Category and Product Type from the dropdown lists and then select the
product from the next page. All resources for that particular product are displayed by default
under the All tab. Documents, downloads and other resources are sorted by the date they were
created so the most recently created resource is at the top of the list. You can further sort the

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list by the tabs across the top of the list to find exactly what you are looking for. Click the title to
open the link.
Specific Documents
Spectralink 84-Series system documents are available on the Spectralink support site at
http://support.spectralink.com/products/wi-fi/spectralink-84-series-wireless-telephone.
Spectralink Configuration Management System Administration Guide The CMS Administration
Guide provides information about every setting and option available to the administrator on
Spectralink 84-Series handsets and CMS. Time-saving shortcuts, troubleshooting tips and other
important maintenance instructions are also found in this document. CMS software and
documents are available on the Spectralink support site at http://support.spectralink.com/cms.
The Spectralink 84-Series Wireless Telephone Administration Guide provides a comprehensive
list of every parameter available on Spectralink 84-Series Wireless Telephones.
Quick Network Connect Administration Guide QNC provides step-by-step instructions for
configuring wireless settings required for the smartphones to associate with the wireless LAN.
QNC software and documents are available on the Spectralink support site at
http://support.spectralink.com/products/wi-fi/qnc.
The Spectralink 84-Series Barcode Administration Guide provides information about barcode
symbologies and how to configure and implement the barcode feature on the handset. The
Spectralink 84-Series User Guide also contains information about using the barcode feature.
Quick Barcode Connector Administration Guide Provides instruction for implementation of the
barcode application. The Spectralink 84-Series User Guide contains information about using the
barcode feature.
The Spectralink 84-Series User Guide offers comprehensive instructions on using each of the
features deployed on the handsets.
The Web Configuration Utility User Guide is used for troubleshooting in certain isolated cases
as explained in the text.
For information about combining Polycom desksets and Spectralink 84-Series handsets in the
same facility, see the Interoperability Guide: Spectralink 84-Series Coexistence with Polycom
Desksets.
For additional information about deploying Microsoft Skype for Business (formerly Lync) in your
phone environment, see Microsoft Skype for Business Interoperability Guide.
For information on IP PBX and softswitch vendors, see the Spectralink 84-Series Call Server
Interoperability Guide.
Technical Bulletins and Feature Descriptions explain workarounds to existing issues and
provide expanded descriptions and examples.

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AP Configuration Guides explain how to correctly configure access points and WLAN controllers
(if applicable) and identify the optimal settings that support Spectralink 84-Series handsets. You
can find them on the VIEW Certified webpage.
White Papers
Spectralink White Papers are available at http://www.spectralink.com/resources/white-papers.
For the Spectralink 84-Series Wireless Telephones, please refer to Best Practices Guide for
Deploying Spectralink 84-Series Handsets for detailed information on wireless LAN layout,
network infrastructure, QoS, security and subnets.
For additional details on RF deployment please see The challenges of ensuring excellent voice
quality in a Wi-Fi workplace and Deploying Enterprise-Grade Wi-Fi Telephony.
These White Papers identify issues and solutions based on Spectralink’s extensive experience
in enterprise-class Wi-Fi telephony. It provides recommendations for ensuring that a network
environment is adequately optimized for use with Spectralink Wireless Telephones.
Conventions Used in This Guide
Icons
Icons indicate extra information about nearby text.
Warning
The Warning icon highlights an action you must perform (or avoid) to avoid
exposing yourself or others to hazardous conditions.
Caution
The Caution icon highlights information you need to know to avoid a hazard that
could potentially impact device performance, application functionality, successful
feature configuration and/or affect phone or network performance.
Spectralink recommends
Our recommendations for successful deployments.
Note
The Note icon highlights information of interest or important information that will
help you be successful in accomplishing a procedure or understanding a concept.

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Tip
The Tip icon highlights information that may be valuable or helpful for users to
know, such as special techniques, shortcut methods, or information that will make
user tasks easier to perform.
Web
The Web Info icon highlights supplementary information available online such as
documents or downloads on support.spectralink.com or other locations.
Timesaver
A time-saving tip is typically used to mention or highlight a faster or alternative
method for users who may already be familiar with the operation or method being
discussed.
Admin Tip
This tip advises the administrator of a smarter, more productive or alternative
method of performing an administrator-level task or procedure.
Power User
A Power User Tip is typically reserved for information directed specifically at high-
level users who are familiar with the information or procedure being discussed and
are looking for better or more efficient ways of performing the task. For example,
this might highlight customization of a feature for a specific purpose.
Troubleshooting
This element can be used in any type of document and is typically used to highlight
information to help you solve a relevant problem you may encounter, or to point to
other relevant troubleshooting reference information.
Settings
The Settings icon highlights information to help you zero in on settings you need to
choose for a specific behavior, to enable a specific feature, or access
customization options.
Typography
A few typographic conventions, listed next, are used in this guide to distinguish types of in-text
information.

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Convention
Description
Bold
Highlights interface items such as menus, soft keys, file names, and
directories. Also used to represent menu selections and text entry to the
phone.
Italics
Used to emphasize text, to show example values or inputs, and to show
titles of reference documents available from the Spectralink Support Web
site and other reference sites.
Underlined blue
Used for URL links to external Web pages or documents. If you click on
text in this style, you will be linked to an external document or Web page.
Bright orange text
Used for cross references to other sections within this document. If you
click on text in this style, you will be taken to another part of this
document.
Fixed-width-font
Used for code fragments and parameter names.
This guide also uses a few writing conventions to distinguish conditional information.
Convention
Description
<MACaddress>
Indicates that you must enter information specific to your installation,
phone, or network. For example, when you see <MACaddress>, enter
your phone’s 12-digit MAC address. If you see <installed-directory>, enter
the path to your installation directory.
>
Indicates that you need to select an item from a menu. For example,
Settings> Basic indicates that you need to select Basic from the
Settings menu.

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Part I: Getting Started
Part I: Getting Started covers basic information you will need to understand the hardware and
software components that comprise a wireless SIP implementation. This Part introduces you to
SIP and managing the configuration parameters that the 84-Series handset requires.
•Infrastructure requirements
•Deployment sequence and usage scenarios
•Configuration parameters and design
•Types of settings

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Chapter 1: Infrastructure
Provisioning a wireless handset is somewhat more complex than plugging a phone cable into a
wall jack and getting a dial tone. You will need to establish a wireless infrastructure specifically
designed for voice communications that takes into consideration the unique quality of service
requirements of voice transmissions. Then you will need to consider the issue of communication
security and decide which method is appropriate for your facility.
Network Components
Delivering enterprise-grade VoWLAN (Voice over Wireless Local Area Network) means that
wireless networks must be designed to provide the highest audio quality throughout the facility.
Voice has different attributes and performance requirements than wireless data applications
making VoIP WLAN pre-deployment planning necessary.
A Wi-Fi handset requires a continuous, reliable connection as the user moves throughout the
coverage area of the facility. In addition, voice applications have a low tolerance for network
errors, packet retries and packet delays. Whereas data applications are able to accept frequent
packet delays and retransmissions, wireless voice quality will deteriorate with just a few hundred
milliseconds of delay or a very small percentage of lost packets. Additionally, data applications
are typically bursty in terms of bandwidth utilization; whereas voice conversations use a
consistent and a relatively small amount of network bandwidth throughout the length of a
conversation.
This chapter covers the basic elements in a relatively simple system. Recommendations for
your specific requirements are part of the service Spectralink includes with the installation of
Spectralink wireless telephones. The following information will give you an overview of what
each component does and how it is used by the wireless telephones.
Recommended Reading
Spectralink White Papers are available at http://www.spectralink.com/resources/white-papers.
For the Spectralink 84-Series Wireless Telephones, please refer to Best Practices Guide for
Deploying Spectralink 84-Series Handsets for detailed information on wireless LAN layout,
network infrastructure, QoS, security and subnets.
For additional details on RF deployment please see The challenges of ensuring excellent voice
quality in a Wi-Fi workplace and Deploying Enterprise-Grade Wi-Fi Telephony.
These White Papers identify issues and solutions based on Spectralink’s extensive experience
in enterprise-class Wi-Fi telephony. It provides recommendations for ensuring that a network
environment is adequately optimized for use with Spectralink Wireless Telephones.

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Quality of Service
The Spectralink 84-Series handset uses Wi-Fi Multimedia (WMM), WMM Power Save and
WMM Admission Control mechanisms to deliver enterprise-grade Quality of Service (QoS). The
use of WMM and WMM Power Save are required. You can disable WMM Admission Control in
the access points if needed. However the use of all three WMM specifications is highly
recommended by Spectralink and is the default operating mode of the handset.
Refer to Best Practices Guide to Network Design Considerations for Spectralink Wireless
Telephones.
AP Configuration Guides show you how to correctly configure access points and WLAN
controllers (if applicable) and identify the optimal settings that support Spectralink 84-Series
handsets. The guides can be found at the View Certified page.
WLAN Security
Wireless technology does not provide any physical barrier from malicious attackers since radio
waves penetrate walls and can be monitored and accessed beyond the wall even from outside
the facility. The extent of security measures used is typically proportional to the value of the
information accessible on the network. The security risk for VoWLAN is not limited to the typical
wired telephony concerns of eavesdropping on telephone calls or making unauthorized toll calls,
but is equivalent to the security risk of the data network that connects to the APs. Several
different security options are supported on Spectralink 84-Series Wireless Telephones.
Determining the proper level of security should be based on identified risks, corporate policy
and an understanding of the pros and cons of the available security methods.
Security Methods
The security methods available for Spectralink Wireless Telephones are industry standard
implementations used in typical Enterprise VoIP installations. The scope of this document does
not include a complete analysis of security methods. Refer to Best Practices for Wireless
Security for detailed information.
Wireless
Security
Method
Security in
Enterprise
Environments
Audio
Ease of Configuration and Other General Information
WEP
Poor
Excellent
Easy to administer, little processing overhead, adequate
security for many home Wi-Fi networks. Easily
compromised with hacking tools readily available on the
internet. Every phone can decrypt every other phone’s
data. Still in use on some older enterprise networks.
WPA-PSK
Acceptable
Excellent to
Good
Acceptable security for many small business Wi-Fi
networks. Each phone negotiates a key (see TKIP
below) with the AP so phones can’t decrypt each other’s
data, although a sophisticated hacking device that

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Wireless
Security
Method
Security in
Enterprise
Environments
Audio
Ease of Configuration and Other General Information
knows the PSK can decode anyone’s traffic. The
problem can be minimized with periodic rotation of long,
hard-to-hack passwords.
WPA2-
PSK
Acceptable to
Good
Excellent to
Good
Good security for most small business Wi-Fi networks.
Similar to WPA with the addition of AES/CCMP, one of
the most secure encryption algorithms available. The
PSK limitation is still an issue, however.
WPA2-
Enterprise1
Excellent
Excellent to
Poor
Excellent security for enterprise Wi-Fi network. PSK is
replaced by some form of EAP and a RADIUS server,
and each phone is configured with its own username
and password, making the conversation between phone
and AP completely private. The processing
requirements of a RADIUS server, however, can
compromise handoffs, so a fast-roaming technique such
as OKC or CCKM must be employed.
1WPA2-Enterprise variables:
84-Series handsets use authentication types: EAP-TLS, EAP-FAST or PEAPv0 with MSCHAPv2. EAP-
TLS uses a certificate to authenticate both the device and server. EAP-FAST is used by products of
Cisco, its creator, and by a growing number of other WLAN vendors. It uses a PAC file, which is similar
to a certificate. PEAPv0 with MSCHAPv2 is the most common form of PEAP, which uses a certificate
to authenticate the server.
84-Series handsets use either of two fast-handoff techniques as they roam among APs: CCKM or
OKC. CCKM is used exclusively by Cisco APs. OKC is used by most non-Cisco APs.

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System Diagram
The following diagram shows the Spectralink components residing on a typical network with
APs and wireless LAN Ethernet Switch.
Tip: Are multiple servers necessary?
Sometimes a single piece of hardware may provide multiple services, for example
some AP controllers can also provide radius services. Consult your service
provider for more information about how to tailor your system configuration for your
requirements.

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System Requirements
A typical installation requires the following components:
•Access Points (APs) and Controller
•Ethernet Switch
•Call Server (SIP server)
•CMS Server
•Simple Network Time Protocol Server
•Authentication (RADIUS)Server
•DHCP Server
Optional components:
•Exchange Server
•LDAP Server
•Application Server
System Components
Spectralink 84-Series handsets.
Available in several models, the 84-Series handsets provide essential communication resources
for facility wide implementation. Each model has a unique hardware ID that is printed on the
label.
Handset hardware ID numbers
Model Name
Hardware ID
SL8440
SL8450
SL8452
SL8441
SL8453
3111-36150-001
3111-36152-001
3111-36154-001
3111-67360-001
3111-67361-001
8440
The basic model that includes basic and advanced wireless telephone features.
8441
An accelerometer has been added to the 8440 that enables it to utilize the Personal Alarm
feature.

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8450
The features of the 8440 model plus barcode scanning for 1D scanning for use with or without
the Quick Barcode Connector application.
8452
The features of the 8440 model plus barcode scanning for both 1D and 2D scanning for use
with or without the Quick Barcode Connector application.
8453
An accelerometer has been added to the 8454 that enables it to utilize the Personal Alarm
feature.
Servers
CMS Server
See Spectralink Configuration Management System Administration Guide for detailed
requirements and installation procedures.
Time Server
Simple Network Time Protocol Server or SNTP server. When WPA2 Enterprise security is used,
the handset will use this data to confirm the PAC or certificate has a valid date and time. If an
NTP Server is not available, the certificate will be assumed valid and operate accordingly,
without the date and time check.
RADIUS Server
A RADIUS authentication server must be used to provide username/password-based
authentication using RSA certificates for EAP-TLS, PEAPv0/MSCHAPv2 or PAC files for EAP-
FAST.
The following authentication servers have been validated for use with Spectralink 84-Series
handsets:
•Juniper Networks Steel-belted Radius Enterprise Edition (formerly Funk), v6.1
•Microsoft®Internet Security and Acceleration (ISA) Server 2003, Windows 2008 NPS
•Cisco Secure Access Control Server (ACS), v5.2, 4.1
•FreeRADIUS v2.1.10, 2.0.1 and 1.1.7
Other RADIUS servers may work properly with Spectralink handsets, but have not been tested.
Inquiries on untested servers will receive limited, “Best Effort”, support.

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DHCP Server
Dynamic Host Configuration Protocol (DHCP) is a standardized protocol that enables clients to
be dynamically assigned with various configuration parameters, such as an IP address, subnet
mask, default gateway, and other critical network configuration information. DHCP servers
centrally manage such configuration data, and are configured by network administrators with
settings that are appropriate for a given network environment. The handset will use the DHCP
options shown in the following table if DHCP use is enabled. The DHCP setting will usually take
precedence if it is set and if it is available but can be overridden by certain parameters.
Option
SIP Parameter
Meaning
1
NA
Subnet mask
3
NA
Default gateway
6
DNSSRVR
DNS server
7
LOGSRVR
Syslog server logging
15
DOMAIN
Domain name
42
SNTPSRVR
NTP Server
43
sec.TLS.customCaCert.x
Auto discovery of the root CA
certificate. If this setting is
unavailable, set the parameter per
this guide.
66
TFTPSRVR
TFTP server
Consult with your service provider if you choose to use static configuration.
SIP Call Server
The call server provides SIP telephony support.
Access points
Enterprise-grade Wi-Fi access points provide the connection between the wired LAN and the
wireless LAN. VIEW Certified APs must be positioned in all areas where Spectralink handsets
will be used to ensure seamless radio coverage. The number, type and placement of access
points will affect the coverage area and capacity of the wireless system. Careful planning of the
WLAN is necessary to ensure excellent voice quality. An’ optimized for voice’ WLAN will yield
great benefits to the wireless telephone user community.
APs must be properly configured to support the corresponding QoS and security methods
selected for the 84-Series handset.

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Ethernet switch
One or more Ethernet switches interconnect multiple network devices. Enterprise Ethernet
switches provide the highest performance networks, which can handle combined voice and data
traffic, and are required when using the Spectralink 84-Series Wireless Telephones.
Ensure the WLAN and network infrastructure provides connectivity from the wireless telephone
to all its required network resources (SIP Server, etc.) once the 84-Series handset connects to
the network and obtains an IP address.
Spectralink 84-Series Wireless Telephones cannot roam with uninterrupted service between
subnets unless specific LAN components are present. Certain AP/Ethernet switch combinations
establish a Layer-3 tunnel across subnets that enable the handsets to roam. Without this
capability, any call in progress will be dropped when the user moves out of range and the
handset must be power cycled in order to resume functionality in the new subnet area. Consult
your AP vendor document for more information about Layer 3 tunneling.
If you do not have Layer 3 capability, ensure that the SSID your phones associate with uses the
same subnet on all APs for proper operation.. The handset can change subnets if DHCP is
enabled and the handset is powered off then back on when within range of APs on the new
subnet. Note that the wireless telephones cannot “roam” across subnets, since they cannot
change IP addresses while operational.