we have a couple of Cisco 2504 WLC in active/standby mode, running version 220.127.116.11 and with 30 AP associated.
AP model are: AIR-CAP1702I-E-K9 and AIR-AP1852E-E-K9.
Cordless and smartphone can join to 2 different SSID which can run both to 2.4 and 5 Ghz and Qos settings are one on "gold" and the other one on "platinum".
Aironet IE is enabled for both SSID.
Regardless of SSID, phones present bad performances in which voice sometimes disappears (for examples on 10 words spoken you can hear just 5/6). During real time test, I have noticed that signal strenght was good, similar to this:
Signal Strength: -32 dBm Signal Quality: 67 dB Connection Speed: 54 Mbps Channel Width: 20 MHz
802.11g (2.4GHz) Spatial Stream: 0
The same happens with 72 Mpbs of speed.
Ping to this cordless during test was around 1% of packet loss.
Another thing I have noticed is that during roaming between APs, voice was totally mute, and after roaming speaking was still bad.
So, roaming probably is a problem, but the big one is that performance are always poor. Do you have any idea about what we can manage to improve voice quality?
Thanks in advance,