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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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