cisco phone 7921 handover time from one AP to other is high

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May 29th, 2011
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I am working on a project where voice over wireless is implemented using 7921 Wireless phone and controller running on version When I move speaking over the phone, from one AP towards another, there is voice drop for 5-6 seconds and then voice comes back.  The Client Roaming parameters for 802.11a/n are as follows.

Mode Default Custom
Minimum RSSIdBm
Scan ThresholddBm
Transition TimeSeconds

I am not facing this issue where APs are very closely located. where APs are placed little far, I have these issues. But there is no signal drop when i move from one AP to other. There is only voice packet drop. Please suggest on improving the handover time in such case. Thank you.


Madhan kumar G

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migilles Mon, 08/01/2011 - 23:31
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First, would suggest to upgrade the WLC to

1.4(2) will have more aggressive scanning.

If 1.3(3) works better than 1.3(4) or 1.4(1), then open a TAC case and may be able to provide some dev phone code.

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