Chapter 9 Troubleshooting the Cisco Wireless IP Phone 7920
Resolving Voice Quality and Roaming Problems
9-14
Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 4.0 and 4.1
OL-7104-01
Step 4
From Cisco CallManager, select
Device > Phone
and verify that you have
assigned the correct MAC address to this Cisco IP Phone.
To determine the MAC address of a phone, see the
“Viewing the Media Access
Control Address” section on page 6-5
.
Step 5
Power cycle the phone.
Symptom: The Cisco Wireless IP Phone Has Audio Problems
When users report that active phone calls have poor voice quality that includes
choppy audio, static or gaps in audio, or no audio, you can use the following
suggestions to identify the cause of the problem.
These sections can assist you with the following symptoms:
•
No Audio During a Connected Call, page 9-14
•
One-Way Audio During a Connected Call, page 9-14
No Audio During a Connected Call
If you are not using release 2.0, then you must disable TKIP and MIC features on
the access point. These features are only supported with release 2.0 on the
Cisco Wireless IP Phone 7920.
One-Way Audio During a Connected Call
Use the following list to identify possible causes for the problem:
•
Check the access point to see that the transmit power setting matches the
transmit power setting on the phone. One-way audio is common when the
access point power setting is greater (100mW) than that of the phone
(20mW).
Cisco Wireless IP Phone 7920 Firmware Release 1.08 and later supports
dynamic transmit power control (DTPC). The phone uses the transmit power
that the access point advertises upon association.
Summary of Contents for 7920 - Unified Wireless IP Phone VoIP
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