Cisco 8821

Related Topics
Roaming and Voice Quality or Lost Connection Problems, on page 123
One-Way Audio or No Speech Path
Problem
One or more people on a call do not hear any audio.
Solution
Use the following list to identify possible causes for the problem:
•
Check the access point to see if 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 than that of the phone.
The phone firmware supports dynamic transmit power control (DTPC). The phone uses the transmit
power that the access point advertises upon association.
With DTPC, 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.
Note
•
Check that the access point is enabled for ARP caching. When the phone is in power save mode or
scanning, the access point can respond to the wireless IP phone only when ARP caching is enabled.
•
Check your gateway and IP routing for voice problems.
•
Check if a firewall or NAT is in the path of the RTP packets. If so, you can use Cisco IOS and PIXNAT
to modify the connections so that two-way audio is possible.
•
Check that the Data Rate setting for the phone and the access point are the same. These settings should
match or the phone should be set for Auto.
•
Check the phone hardware to be sure the speaker is functioning properly.
•
Check that the speaker is functioning properly. Adjust the speaker volume setting and call the phone to
check the speaker.
Ring Volume is Too Low
Problem
User complains that the ringer on the phone is not loud enough.
Solution
Press the Volume button on the side of the phone, and increase the volume.
Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager
121
Troubleshooting
One-Way Audio or No Speech Path