voice gaps in cisco ip phones 7921 when roaming between cisco APs

Mustafa Al Housami · ‎01-27-2009

The following problem is faced when cisco ip phones 7921 are roaming between APs:

When a call is establishedon wireless ip phones, and the phones are roaming between APs, a three seconds gap appears but the call doesn't disconnect.

The following log messages are displayed on both APs:

The first AP:

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*Mar 1 23:30:30.493: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 001e.4a3f.c5b8 Reason: Sending station has left the BSS

*Mar 1 23:30:30.956: %DOT11-4-MAXRETRIES: Packet to client 001e.4a3f.c5b8 reached max retries, removing the client

*Mar 1 23:30:30.957: Client 001e.4a3f.c5b8 failed: reached maximum retries

The second AP:

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*Mar 1 23:33:40.049: %DOT11-6-ASSOC: Interface Dot11Radio0, Station SEP001E4A3FC5B8 001e.4a3f.c5b8 Associated KEY_MGMT[WPA PSK]

What can be the problem?

Thanks

didyap · ‎02-02-2009

That above error message is frequently associated with another error message "%DOT11-6- DISASSOC: Interface Dot11Radio0, Deauthenticating Station

Reason: Sending station has left the BSS ". This occurs because of the Interference from the adjacent access point. So change the channel and adjust the excessive power on the access points so that there is no too much overlap on the access points coverage cells.