Chapter 9 Troubleshooting the Cisco Wireless IP Phone 7920
Resolving Voice Quality and Roaming Problems
9-12
Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 4.0 and 4.1
OL-7104-01
Identifying Intermittent Network Outages
Intermittent network outages affect data and voice traffic differently. Your
network might have been experiencing intermittent outages without detection. If
so, data traffic can resend lost packets and verify that packets are received and
transmitted. However, voice traffic cannot recapture lost packets. The phone can
retransmit and attempt to recover, or if the phone reaches the maximum retransmit
rate, it drops the packets or loses association with the access point.
If you are experiencing problems with the voice network, you should investigate
whether an existing problem is simply being exposed.
Verifying DHCP Settings
To determine if the phone has been properly configured to use DHCP, follow these
steps:
Step 1
Verify that you have properly configured the phone to use DHCP. See the
“Modifying DHCP Settings” section on page 5-4
for details.
Step 2
Verify that the DHCP server has been set up properly.
Step 3
Verify the DHCP lease duration. Your local policy determines this setting.
Cisco IP Phones send messages with request type 151 to renew their DHCP
address leases. If the DHCP server expects messages with request type 150, the
lease will be denied, forcing the phone to restart and request a new IP address
from the DHCP server.
Verifying Voice VLAN Configuration
If the Cisco IP Phone appears to reset during heavy network usage (for example,
following extensive web surfing on a computer connected to same access point
and switch as phone), it is likely that you do not have a voice VLAN or the
appropriate QoS settings configured.
By isolating the wireless phones on a separate auxiliary VLAN, you can use QoS
to prioritize the voice traffic over data traffic and improve the voice quality. See
the
“Voice Quality in a Wireless Network” section on page 2-12
for details.
Содержание 7920 - Unified Wireless IP Phone VoIP
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