sound issue with cisco 2801 router

[faithful4u]

its a strange issue. i have 6MB bandwidth on three SHDSL wic cards, each can handle 2mbps on load balance. everything is perfectly working fine except calling cards. i mean to say that calling over voip softwares. examples-jumblo,net2phone,phoneserve....

when bandwith is below 2mb even this calling cards also work fine, but once the bandwidth reach more than 4mb the incomming voice got lots of distrubance but outgoing voice is perfectly fine,means caller can hear me but i cant hear them properly. please help me to find out the issue. here is the running config.....


Current configuration : 4113 bytes
!
! No configuration change since last restart
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname layali-2
!
boot-start-marker
boot-end-marker
!
logging buffered 4096 debugging
enable password [password]
!
no aaa new-model
clock timezone KWST 3
ip cef
!
!
!
!
no ip domain lookup
ip name-server 196.1.69.98
ip name-server 196.1.69.100
!
!
!
controller DSL 0/1/0
mode atm
line-term cpe
line-mode 2-wire line-zero
dsl-mode shdsl symmetric annex B
line-rate auto
!
controller DSL 0/2/0
mode atm
line-term cpe
line-mode 2-wire line-zero
dsl-mode shdsl symmetric annex B
line-rate auto
!
controller DSL 0/3/0
mode atm
line-term cpe
line-mode 2-wire line-zero
dsl-mode shdsl symmetric annex A
line-rate auto
!
!
class-map match-any match-p2p-protocols
match protocol gnutella
match protocol fasttrack
match protocol http url "*/.hash* "
match protocol http url "*/.message*"
match protocol http url "*kmdstart*"
match protocol kazaa2
!
!
policy-map block-all-p2p
class match-p2p-protocols
police 8000 conform-action drop exceed-action drop violate-action drop
!
!
!
interface FastEthernet0/0
ip address 168.187.15.129 255.255.255.128
ip access-group 150 in
ip access-group 150 out
no ip proxy-arp
ip nat inside
duplex auto
speed auto
no cdp enable
hold-queue 1024 out
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface ATM0/1/0
no ip address
no atm ilmi-keepalive
!
interface ATM0/1/0.1 point-to-point
description "******Link to KEMS: 24755174*****"
bandwidth 2048
ip address 168.187.109.54 255.255.255.252
ip load-sharing per-packet
ip nat outside
no snmp trap link-status
atm route-bridged ip
pvc 0/35
protocol ip 168.187.109.53 broadcast
no oam-pvc manage
encapsulation aal5snap
!
!
interface ATM0/2/0
no ip address
no atm ilmi-keepalive
!
interface ATM0/2/0.1 point-to-point
description "******Link to KEMS: 24751417*****"
bandwidth 2048
ip address 168.187.68.26 255.255.255.252
ip load-sharing per-packet
ip nat outside
no snmp trap link-status
atm route-bridged ip
pvc 0/35
protocol ip 168.187.68.25
no oam-pvc manage
encapsulation aal5snap
!
!
interface ATM0/3/0
no ip address
ip load-sharing per-packet
no atm ilmi-keepalive
!
interface ATM0/3/0.1 point-to-point
description "******Link to KEMS: 24753122*****"
bandwidth 2048
ip address 168.187.238.138 255.255.255.252
ip load-sharing per-packet
ip nat outside
no snmp trap link-status
pvc 0/35
protocol ip 168.187.238.137 broadcast
no oam-pvc manage
encapsulation aal5snap
!
!
router eigrp 6412
variance 2
network 168.187.15.128 0.0.0.127
network 168.187.68.26 0.0.0.0
network 168.187.109.54 0.0.0.0
network 168.187.238.138 0.0.0.0
no auto-summary
!
ip route 168.187.15.131 255.255.255.255 Null0
!
ip http server
!
access-list 150 deny udp any any eq tftp
access-list 150 deny tcp any any eq 135
access-list 150 deny udp any any eq 135
access-list 150 deny udp any any eq netbios-ns
access-list 150 deny udp any any eq netbios-dgm
access-list 150 deny udp any any eq netbios-ss
access-list 150 deny tcp any any eq 139
access-list 150 deny tcp any any eq 445
access-list 150 deny tcp any any eq 5000
access-list 150 deny tcp any any eq 6129
access-list 150 deny tcp any any eq 2745
access-list 150 deny tcp any any range 6346 6347
access-list 150 deny udp any any range 6346 6347
access-list 150 deny tcp any any eq 4662
access-list 150 deny udp any any eq 4662
access-list 150 deny udp any any eq 4672
access-list 150 deny udp any any range 6881 6889
access-list 150 deny tcp any any range 6881 6889
access-list 150 deny tcp any any eq 6699
access-list 150 deny udp any any eq 6257
access-list 150 permit ip any any
snmp-server community public RO
snmp-server community private RW
!
control-plane
!
!
line con 0
password 7 [password]
login
line aux 0
line vty 0 4
password 7 [password]
login
!
scheduler allocate 20000 1000
sntp server 196.1.69.111
sntp server 192.43.244.18
end