IP Phone drops wirless conneciton

Hi
I've a strange problem. I have a wirelss bridged connection using x cisco 1310 APs with directional YAGI antennas. The network is stable and working fine until I connect a Cisco 7940 phone. During calls the phone seems to drop the assocaition between the two APs and I have to end up rebooting both APs to get the network back. The network is used for 4 people and we are getting rates of 24Mbps so I don't think it will be down to congestion.
Any ideas or pointers would be appreciated. Thanks
Rod
hostname C10-AP-01
logging monitor warnings
aaa new-model
aaa group server radius rad_eap
aaa group server radius rad_mac
aaa group server radius rad_acct
aaa group server radius rad_admin
aaa group server tacacs+ tac_admin
server 10.118.0.5
aaa group server radius rad_pmip
aaa group server radius dummy
aaa authentication login default group tac_admin local
aaa authentication login eap_methods group rad_eap
aaa authentication login mac_methods local
aaa authorization exec default group tac_admin local
aaa accounting network acct_methods start-stop group rad_acct
aaa session-id common
dot11 syslog
dot11 ssid *****
   authentication open
username Cisco password 7 ***
username boadmin privilege 15 password 7 ***
username rod privilege 15 password 7 ***
class-map match-all _class_C10-VOIP-QOS1
match ip dscp ef
class-map match-all _class_C10-VOIP-QOS0
match ip precedence 5
policy-map C10-VOIP-QOS
class _class_C10-VOIP-QOS0
set cos 6
class _class_C10-VOIP-QOS1
set cos 6
bridge irb
interface Dot11Radio0
no ip address
no ip route-cache
ssid N1ght5hade
speed basic-1.0 basic-2.0 basic-5.5 basic-11.0 basic-6.0 basic-9.0 basic-12.0 basic-18.0 basic-24.0 basic-36.0
channel 2437
station-role root bridge
distance 4
bridge-group 1
bridge-group 1 spanning-disabled
interface FastEthernet0
no ip address
no ip route-cache
bridge-group 1
bridge-group 1 spanning-disabled
service-policy output C10-VOIP-QOS
interface BVI1
ip address 10.118.81.148 255.255.255.248
no ip route-cache
ip http server
ip http authentication aaa
no ip http secure-server
ip http help-path http://www.cisco.com/warp/public/779/smbiz/prodconfig/help/eag
ip radius source-interface BVI1
logging 10.118.12.88
snmp-server community **** RO
snmp-server enable traps disassociate
snmp-server enable traps deauthenticate
snmp-server enable traps authenticate-fail
snmp-server enable traps dot11-qos
snmp-server enable traps switch-over
snmp-server enable traps rogue-ap
snmp-server enable traps wlan-wep
snmp-server enable traps syslog
snmp-server host 10.118.12.88 version 2c ****
tacacs-server host 10.118.0.5 key 7 ****
tacacs-server directed-request
radius-server attribute 32 include-in-access-req format %h
radius-server vsa send accounting
bridge 1 route ip
line con 0
line vty 0 4
sntp server 10.118.6.1
sntp broadcast client
end
C10-AP-01#sh dot11 associations all-client
Address           : 001b.d5c0.bec0     Name             : B21-AP-01
IP Address        : 10.118.81.147      Interface        : Dot11Radio 0
Device            : bridge             Software Version : 12.4
CCX Version       : 5                  Client MFP       : Off
State             : Assoc              Parent           : self
SSID              : N1ght5hade
VLAN              : 0
Hops to Infra     : 1                  Association Id   : 1
Clients Associated: 1                  Repeaters associated: 0
Tunnel Address    : 0.0.0.0
Key Mgmt type     : NONE               Encryption       : Off
Current Rate      : 36.0               Capability       : WMM ShortHdr ShortSlot
Supported Rates   : 1.0 2.0 5.5 11.0 6.0 9.0 12.0 18.0 24.0 36.0
Voice Rates       : disabled           Bandwidth        : 20 MHz
Signal Strength   : -78 dBm           Connected for    : 271407 seconds
Signal to Noise   : 21 dB            Activity Timeout : 30 seconds
Power-save        : Off                Last Activity    : 0 seconds ago
Apsd DE AC(s)     : NONE
Packets Input     : 8728659            Packets Output   : 8983962
Bytes Input       : 2431701726         Bytes Output     : 2706208314
Duplicates Rcvd   : 7                  Data Retries     : 3774685
Decrypt Failed    : 0                  RTS Retries      : 424975
MIC Failed        : 0                  MIC Missing      : 0
Packets Redirected: 0                  Redirect Filtered: 0

Console in to your bridges and make sure that they are droping the wireles link when th eproblem happens.
The root cause is the horrible signal strength you are having. It's barely enough to have the brindge link up. So as soon as there is too many retransmissions it's dropping the link.
The command "packet retries 16 drop-packet" will prevent the wireless link to drop, but it won't solve the many retransmissions due to poor signal

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