Symptom: Audio Problems; No Audio During A Connected Call; One-Way Audio During A Connected Call - Cisco 7925G - Unified Wireless IP Phone VoIP Administration Manual

Resolving Voice Quality and Roaming
c.
Step 3 From Cisco Unified Communications Manager, choose System > Server and verify that the server is
referred to by its IP address and not by its host name.
Note
From Cisco Unified Communications Manager, select Device > Phone and verify that you have
Step 4
assigned the correct MAC address to this Cisco Unified IP Phone.
To determine the MAC address of a phone, see the
Power cycle the phone.
Step 5

Symptom: 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

If you are using a release earlier than 2.0, then you must disable TKIP and MIC features on the access
point. These features are only supported with release 2.0 and later on the Cisco Unified Wireless
IP Phone 7925G.

One-Way Audio During a Connected Call

Use the following list to identify possible causes for the problem:
•
Note
•
Cisco Unified Wireless IP Phone 7925G Administration Guide for Cisco Unified Communications Manager 7.0(1)
10-10
Assign a TFTP server. See the
details. Use the same TFTP server used for other functioning Cisco Unified IP Phones.
Cisco recommends that you configure IP addresses only and not host names to eliminate the
DNS resolution in the phone registration process.
No Audio During a Connected Call, page 10-10
One-Way Audio During a Connected Call, page 10-10
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 Unified Wireless IP Phone 7925G Firmware supports dynamic transmit power control
(DTPC). The phone uses the transmit power that the access point advertises upon association.
With DTCP, if Client Transmit Power is set in the access point, the phone automatically uses the
same client power setting. If the access point is set for the maximum setting (Max), the access
point uses the Transmit Power setting on the phone.
Check that the access point is enabled for ARP caching. When the Cisco Unified Wireless
IP Phone 7925G is in power save mode or scanning, the access point can respond to the wireless IP
phone only when ARP caching is enabled.
Chapter 10 Troubleshooting the Cisco Unified Wireless IP Phone 7925G
"Configuring an Alternate TFTP Server" section on page 5-7
"Viewing Device Information" section on page
for
8-4.
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