ISSUES 7921G roaming whit push to talk

Hello,
We have a deployment with many Cisco AP around 100, the AP are closer each other,This AP only works with 2.4 radio, because the radio of 5 don´t have anntenas to work so the only radio to cover the deplyment is the 2.4 Ghz.
The network was designed and installed by another company, they mounted 20 Aps to cover offices and 80 Aps to cover a warehouse mounted higt around 65 feet and there are separates each other around 41 feet.
I am having issues with 7921G phones roaming through a 802.11b/g, The phones do not seem to be moving on to nearby APs at the right time therfore alowing the call to degrade and drop out, I was hoping someone could give me some tips on WLC configuration and AP power to optimize the system already installed. I am really limited as to the amount and location of the APs
This issue it´s more when use the 7921G the push to talk ficture
The WiFi network has plenty of APs installed. It certainly has -67dbm coverge in all areas and also a more than of 20% overlap.
7921G ver 1.3.2
WLC 4400 ver 7.0.116.0
CCM ver 4.0
APs: AIR-LAP1242AG-N-K9
Thanks you
XU

Hi,
I Used the tool, but the only change it´s recomended it´s in the 802.11a network but this frecuency its not possible, because the 802.11a network was disabled.
I upgrade WLC firmware to the 7.0.235.0, and the data rate there are available are 9 for mandatory and the other higher data rates are supported.
The security for the phones are wep, and the multicast mode are Unicast, becuase if I configure the multicast in Multicast mode don´t work with the PTT.
I think in the Wired LAN dont have IP multicas routing. But I cant touch the LAN network.
Best Regards

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Tamim
Location - Dhaka | Bangladesh - Standard Time Zone: GMT/UTC + 06:00 hour
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ISSUES 7921G roaming whit push to talk

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