Cisco 7920 IP - Manual

Cisco 7920 IP

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Table of Contents:

  • Page 2 – Requirements
  • Page 3 – Components Used; Cisco 7920 IP Phone Overview
  • Page 4 – VoIP QoS
  • Page 6 – Security for the Cisco 7920 and WLAN Networks
  • Page 7 – Network Sizing; Number of 802.11b IP Phones per AP
  • Page 9 – Numbers of 802.11b Phones per Layer 2 Subnet or VLAN
  • Page 10 – Understanding Layer 2 and Layer 3 Roaming; Understanding Roaming Terminology
  • Page 11 – Layer 2 Roaming
  • Page 13 – Layer 3 Roaming
  • Page 14 – VLANs
  • Page 15 – WLAN QoS for VoIP
  • Page 19 – Interconnecting WLANs to Cisco Campus Infrastructure
  • Page 20 – Connecting APs to the Catalyst 3550 SMI or EMI
  • Page 22 – Caveats and Limitations
  • Page 23 – Call Admission Control; Designing Around the Lack of Layer 3 Roaming
  • Page 24 – Related Information
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Table of Contents

Wireless IPT Design Guide for the Cisco 7920 IP Phone................................................................................1

Introduction.............................................................................................................................................1
Prerequisites............................................................................................................................................1

Requirements....................................................................................................................................1
 Components Used.............................................................................................................................2
Conventions......................................................................................................................................2

Cisco 7920 IP Phone Overview..............................................................................................................2
WLAN Overview....................................................................................................................................2
RF Overview Site Surveys and Design Recommendations................................................................2
 VoIP QoS................................................................................................................................................3
 Security for the Cisco 7920 and WLAN Networks................................................................................5
 Network Sizing.......................................................................................................................................6

Number of 802.11b Devices per AP................................................................................................6
Number of 802.11b IP Phones per AP.............................................................................................6
 Numbers of 802.11b Phones per Layer 2 Subnet or VLAN............................................................8

Understanding Layer 2 and Layer 3 Roaming........................................................................................9

Understanding Roaming Terminology.............................................................................................9
 Layer 2 Roaming............................................................................................................................10
 Layer 3 Roaming............................................................................................................................12

VLANs..................................................................................................................................................13
 WLAN QoS for VoIP...........................................................................................................................14
 Interconnecting WLANs to Cisco Campus Infrastructure....................................................................18

Connecting APs to the Catalyst 3550 SMI or EMI........................................................................19
 Connecting APs to the Catalyst 2950 EI........................................................................................20
Connecting APs to the Catalyst 2950 SI........................................................................................20

Using Cisco Emergency Responder for E911 calls with the Cisco 7920.............................................20
 Caveats and Limitations........................................................................................................................21

Call Admission Control..................................................................................................................22
Designing Around the Lack of Layer 3 Roaming..........................................................................22
Other Caveats and Limitations.......................................................................................................22

Related Information..............................................................................................................................23

Cisco − Wireless IPT Design Guide for the Cisco 7920 IP Phone

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Summary

Page 2 - Requirements

Wireless IPT Design Guide for the Cisco 7920 IPPhone IntroductionPrerequisites Requirements Components Used ConventionsCisco 7920 IP Phone OverviewWLAN OverviewRF Overview Site Surveys and Design RecommendationsVoIP QoSSecurity for the Cisco 7920 and WLAN NetworksNetwork Sizing Number of 802.11b Dev...

Page 3 - Components Used; Cisco 7920 IP Phone Overview

AVVID design guides and administration. • Components Used The information in this document is based on the software and hardware versions below: The Cisco 7920 IP Phone. • The information in this document was created from the devices in a specific lab environment. All of thedevices used in this docu...

Page 4 - VoIP QoS

remember that the Cisco 7920 has somewhat different roaming characteristics than Cisco Aironet NetworkInterface Cards (NICs). This includes thresholds on the Cisco 7920 that determine when the phone roams orhow much the RF environment needs to change in order to determine when a roaming event should...

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