Problem VoIP client roaming

slandeira · ‎07-28-2010

Hello,
I have a problem with roaming between wireless antennas since phones 7921. The phone does the roam between APs when it reaches a -78dB threshold at which the call is cut or degrades much.

In our network VoIP over WLAN we have: 802.11b / g; WLC 2112 (ver.6.0.196.0), 12 access points LAP1131G and phones.

How can do to make the decision to roaming occurs before coming to degrade the call?
My values in "Roaming Client Section" are:

RF Parameters

Mode Custom
Minimum RSSI       -80 dBm
Hysteresis              2 dB
Scan Threshold      -72 dBm
Transition Time       5 Seconds

Thanks.

Susana.

slandeira · ‎07-29-2010

How I can change the decision threshold roam in phone 7921?

George Stefanick · ‎08-02-2010

First, do you have a voice grade network ? Your wireless edge should be -67 for voice by this i mean if your phone is reading higher then -67 anywhere you are outside of voice coverage. You cells should have a 20% cell overlap.

As for the phone, what code on are you on again?

"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
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Jeremiah La Tour · ‎09-28-2010

The 7921 and 7925 phones do not use the WLC's roaming settings. The roaming decisions are made internal to the phones firmware.