[cisco-voip] 7921G suffering from dropped calls while roaming between AP

[Ki Wi]

Hey guys,
I need a little help here. We have lots of newly provision 7921G in the
environment running ver 1.3.4. WPA2/AES/LEAP/CCKM turned on. WLC is on
latest 7.0.98.0. The LAN switches are mostly on 2960S or cat4500 with
sup6lite.

I have read around but doesn't really find much information on how to
troubleshoot this issue. I'm aware that 7921G with version older than 1.3.4
will need to do full reregistration when it roams to the new AP and some
roaming issues with older sup engine.

My colleague actually troubleshoot this issue and he changed the wireless
phone to scan for channel 1/6/11 only (on b/g) , we disabled the A as it
seems like we have a poor coverage with 802.11a. Customer reported that they
tested with 2 phones (one with new setting , one with existing setting), the
phone with new setting doesn't suffer any dropped calls at all. I find it
too amazing to believe so I'm wondering does anyone have similar experience
before? We have other large sites which doesn't suffer this issue. Honestly,
I don't think that's going to be the solution as it requires us to drill
down into low level configuration and manipulate how the phone to scan for
AP in specific channels.

Cheers,
Ki Wi
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