Cisco Wirelss IP phone voice quality degrades when switching from one AP (Cisco Aironet autonomous system) to another.
We have 5 Cisco Aironet 1240 series AP's installed on site. Each AP's are operating in 2.4 GHz band and all are operating on non overlapping channels. AP1 is operating on channel 1, AP2 is operating on channel 6, AP3 is operating on channel 1, AP4 is operating on channel 11, AP5 is operating on channel 8. There is no central controller each AP is operating in Autonomous mode.
When users (Unified Wireless IP Phone 7925G) roams from one AP to other, user is not able to hear anything, sometimes calls are even dropped. Back then it was working perfectly fine. Also the RSSI value while roaming from one AP to other is good. We also tried to scan and used the most non congested channels available (according to Cisco Aironet 1240 - channels 4 and 5 were least congested) still the calls were being dropped.
Re: Cisco Wirelss IP phone voice quality degrades when switching
Thank you migilles for your quick response. I understand that 8 is overlapping 6 and 11. But user cannot hear anything or sometimes calls are being dropped even if user moves from AP with channel 1 to AP with channel 6.
Also I am running IOS version 12.4 and when I looked at the running configuration and did not find "admit-traffic" in there. Should I enable it?
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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