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Unable to make a SIP trunk work.

                   I just set up a two 7940 SIP phones. Ive been trying for days to receive/send calls with no luck.I am using a CISCO 1760 router and I have installed a 4.3 CME version. I configured the phones according to many of the postings and I came to the conclusion that my problem is the way I configured the  phones on the router. I know by fact that the phones have access to URL services, and they can send and receive call whithsin my local network. . Please, can anybody point me on the right direction?. Thanks.

Building configuration...

Current configuration : 4825 bytes
!
! Last configuration change at 14:51:12 CA1_DST Tue Jul 24 2012
! NVRAM config last updated at 14:44:54 CA1_DST Tue Jul 24 2012
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname VOICE
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
clock timezone EST -5
clock summer-time CA1_DST recurring
!
crypto pki trustpoint TP-self-signed-990320880
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-990320880
revocation-check none
rsakeypair TP-self-signed-990320880
!
!
crypto pki certificate chain TP-self-signed-990320880
certificate self-signed 01

  9F53E051 E687F356 AFC69E0A 34521D8D 29046BC6 47CE3C3E 54E698F1

6E0B7166
  DBA9FB31 B2AC424F 572A4081 0248862E 689A3611 E853C8B6 AAA74852

AFFA514A
  431EF188 75EEFA87 2C394197 AB99B453 D31E4349 803D1383 6B2B84F1 2002A8
        quit
ip cef
!
!
no ip dhcp use vrf connected
ip dhcp excluded-address 192.168.18.1 192.168.18.200
!
ip dhcp pool VOICE_SCOPE
   network 192.168.18.0 255.255.255.0
   default-router 192.168.18.200
   option 150 ip 192.168.18.200
   dns-server 4.2.2.2
!
!
ip name-server 192.168.13.2
!
multilink bundle-name authenticated
!
!
!
voice service voip
allow-connections h323 to sip
allow-connections sip to h323
allow-connections sip to sip
sip
  registrar server expires max 600 min 60
!
!
!
!
!
!
!
!
voice register global
mode cme
source-address 192.168.18.200 port 5060
max-dn 144
max-pool 24
load 7960-7940 P0S3-08-6-00
timezone 13
url service http://phone-xml.berbee.com/cgi-bin/weather.pl
file text
create profile sync 000124025500339A
ntp-server 134.214.100.6 mode unicast
!
voice register dn  1
number 7001
name Ubuntu
label Core7
!
voice register dn  2
number 7005
name ccna
label IPccna
!
voice register dialplan  1
type 7940-7960-others
pattern 1 7
!
voice register pool  1
id mac 0013.1A6C.XXXX
type 7940
number 1 dn 1
dtmf-relay rtp-nte sip-notify
codec g711ulaw
!
voice register pool  2
id mac 000B.5F80.XXXX
type 7940
number 1 dn 2
!
!
!
!
!
username 561623XXXX
username username privilege 15 secret 5 $1$W2PC$WHkf.nvnA6SLMAaZsxwSl0
!
!
archive
log config
  hidekeys
!
!
!
!
!
!
interface Loopback0
ip address 192.168.254.254 255.255.255.255
!
interface FastEthernet0/0
ip address 192.168.18.200 255.255.255.0
speed auto
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 192.168.18.1
!
!
ip http server
ip http authentication local
ip http secure-server
ip http path flash:/gui
!
!
!
!
!
tftp-server flash:/phone/7940-7960/P0S3-08-6-00.loads alias

P0S3-08-6-00.loads
tftp-server flash:/phone/7940-7960/P0S3-08-6-00.sb2 alias

P0S3-08-6-00.sb2
tftp-server flash:/phone/7940-7960/P003-08-6-00.bin alias

P003-08-6-00.bin
tftp-server flash:/phone/7940-7960/P003-08-6-00.sbn alias

P003-08-6-00.sbn
!
control-plane
!
!
!
!
!
!
!
!
dial-peer voice 13 voip
preference 1
session protocol sipv2
session target sip-server
incoming called-number 561623XXXX
dtmf-relay rtp-nte
codec g711ulaw
!
!!
!
!
!
line con 0
password password
login
line aux 0
line vty 0 4
password cisco
login
line vty 5 15
password cisco
login
!
ntp clock-period 17179988
ntp server 134.214.100.6
end

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