asterisk users - Aug 2004 - how can i config a Cisco IAD 2430 config as a sip client

Hello,
I have a cisco ATA 188 registering both of its lines
to * I can place calls between then an to kphone an
MSN messenger (both registering with * too), a few
days ago a friend lend me a Cisco IAD 2430 and I was
willing to do the same thing with it, since it has 24
ports I was willing to to use 24 analog phones with it
however something really weird happens I can place
calls from my ata, kphone and msn to a phone on the
IAD but have no sound or ringback tone from it, and
the IAD is also unable to place calls to any extension
in *.
I have attached my current running-config.
I'm not a cisco guy and my IOS knowledge is very
limited.
My IAD, ATA, MSN, Kphone are all on the same network
192.168.0.0/24 so there is no need of a NAT setting.

Please help


		
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Current configuration : 2061 bytes
!
version 12.3
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Asterisk_IAD2430
!
boot-start-marker
boot system slot0:c2430-i6s-mz.123-4.T7.bin
boot-end-marker
!
enable password asterisk26
!
username asterisk
no aaa new-model
ip subnet-zero
no ip domain lookup
!
!
no ftp-server write-enable
!
voice call send-alert
voice rtp send-recv
!
voice service voip 
 sip
!
voice class codec 1
 codec preference 1 g711alaw
 codec preference 2 g711ulaw
 codec preference 3 gsmfr
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
 ip address 192.168.0.206 255.255.255.0
 speed 100
 full-duplex
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
ip classless
no ip http server
!
!
!
!
control-plane
!
!
voice-port 2/0
 input gain 5
 echo-cancel coverage 32
 cptone PA
 timeouts interdigit 5
 description Extension 2700
 station-id name 2700
!
voice-port 2/1
!
voice-port 2/2
!
voice-port 2/3
!
voice-port 2/4
!
voice-port 2/5
!
voice-port 2/6
!
voice-port 2/7
!
voice-port 2/8
!
voice-port 2/9
!
voice-port 2/10
!
voice-port 2/11
!
voice-port 2/12
!
voice-port 2/13
!
voice-port 2/14
!
voice-port 2/15
!
voice-port 2/16
!
voice-port 2/17
!
voice-port 2/18
!
voice-port 2/19
!
voice-port 2/20
!
voice-port 2/21
!
voice-port 2/22
!
voice-port 2/23
!
!
dial-peer cor custom
!
!
!
dial-peer voice 2 pots
 description Otro catch all, esta vez para FXS
 incoming called-number T
!
dial-peer voice 2700 voip
 destination-pattern T
 session target sip-server
!
dial-peer voice 1 voip
 voice-class codec 1
 incoming called-number .
 dtmf-relay h245-alphanumeric
 no vad
!
dial-peer voice 102700 pots
 huntstop
 destination-pattern 2700
 port 2/0
!
sip-ua 
 retry register 5
 registrar ipv4:192.168.0.200 expires 3600
!
!
line con 0
 login local
 transport preferred all
 transport output all
line aux 0
 transport preferred all
 transport output all
line vty 0 4
 password asterisk26
 login
 transport preferred all
 transport input all
 transport output all
!
!
end