A Cisco Unified 7925G Wireless IP Phone is operating on the 5 GHz band and transmitting at a power level of 40 mW.
Which configuration must be done on the controller to avoid one-way audio?
A . Set the maximum power level assignment to 16 dBm.
B . Set the maximum power level assignment to 26 dB
D . In DCA, enable UNII-I channels only.
E . In DCA, enable UNII-II channels only.
Answer: A
Explanation:
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 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.
Note 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.
• 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 the volume settings in the Phone Settings menu.
Reference: http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/7925g/7_0/english/administration/guide/7925trb.html#wp1106778
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