Configure IP Phones with CME GUI

I have set up an IP Phone LAB inGNS3 and VMworkstation. I installed IP communicator software on a couple of VMs, and configured IP Phones on the Router using Command Line and everything worked fine.

Now I want to do the configuration from Scratch on the GUI , instead of Command line.

So I did part of the configuration with CLI, just enough to bring the CME GUI on internet explorer. However if I make any changes , such as setting maximum IP phones and click Set it prompts me to save changes, I do so, but nothing happens on the router configuration file when I run show run.
If I try to add phone from GUI,  I receive a message "No free phone sequence number"


The CLI configuration is as displayed below:

R7#sh run
Building configuration...

Current configuration : 1088 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R7
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
no ip icmp rate-limit unreachable
ip cef
!
!
no ip dhcp use vrf connected
ip dhcp excluded-address 192.168.137.1 192.168.137.5
!
ip dhcp pool MyPool
   network 192.168.137.0 255.255.255.0
   option 150 ip 192.168.137.2
   default-router 192.168.137.2
!
!
no ip domain lookup
 !
ip tcp synwait-time 5
 !
interface FastEthernet0/0
 ip address 192.168.137.2 255.255.255.0
 duplex auto
 speed auto
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
!
!
!
ip http server
no ip http secure-server
ip http path flash:
 !
control-plane
 !
telephony-service
 max-conferences 4 gain -6
 dn-webedit
 time-webedit
!
!
line con 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
line aux 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
line vty 0 4
 login
!
!
end

R7#

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