I am trying to add two IPPHONES in a VLAN and it does not seem to be working as the phones are not receiving their ip addresses. I have a router going through a switch and the phones are then connected to the switch. I am following this https://edsonvuma.wordpress.com/2013/06/10/configuring-voip-basic-level_packet-tracer/ tutorial.
What is the best or most common method of adding these phones?
Here is my three switch Configurations and my diagram 
Lan-Switch1:
interface FastEthernet0/1
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/2
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/3
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/4
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/5
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/6
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/7
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/8
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/9
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/10
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/11
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/12
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/13
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/14
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/15
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/16
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/17
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/18
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/19
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/20
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/21
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/22
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/23
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/24
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface GigabitEthernet0/1
description Connection to Switch 2 GigabitEthernet0/1
switchport trunk native vlan 999
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet0/2
description Connection to Switch 3 GigabitEthernet0/1
switchport trunk native vlan 999
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface Vlan1
no ip address
shutdown
!
interface Vlan10
description classroom 1 and classroom 2
ip address 192.168.10.1 255.255.255.0
!
interface Vlan11
description classroom 3 and classroom 4
ip address 192.168.11.1 255.255.255.0
ip helper-address 192.168.10.254
!
interface Vlan12
description secretary and principal
ip address 192.168.12.1 255.255.255.0
ip helper-address 192.168.10.254
!
ip classless
!
ip flow-export version 9
!
!
!
!
!
!
!
logging 192.168.10.254
line con 0
exec-timeout 6 50
password 7 080C556D061716181E0E
logging synchronous
login
!
line aux 0
!
line vty 0 4
exec-timeout 5 30
password 7 080C557A0C150B1206
logging synchronous
login
line vty 5 15
exec-timeout 5 30
password 7 080C557E080A16001D1908
logging synchronous
login
!
!
ntp authentication-key 1 md5 0832494D1B1C112713181F13253920 7
ntp server 192.168.10.254 key 0
!
end
Lan-Switch2:
spanning-tree mode rapid-pvst
spanning-tree portfast default
!
interface FastEthernet0/1
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/2
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/3
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/4
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/5
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/6
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/7
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/8
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/9
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/10
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/11
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/12
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/13
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/14
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/15
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/16
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/17
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/18
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/19
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/20
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/21
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/22
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/23
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface FastEthernet0/24
switchport access vlan 11
switchport mode access
spanning-tree portfast
spanning-tree guard root
!
interface GigabitEthernet0/1
description Connection to switch 1 GigabitEthernet0/1
switchport trunk native vlan 999
switchport mode trunk
!
interface GigabitEthernet0/2
description UNUSED
switchport trunk native vlan 999
switchport mode trunk
shutdown
!
interface Vlan1
no ip address
shutdown
!
interface Vlan10
description classroom 1 and classroom 2
ip address 192.168.10.2 255.255.255.0
!
logging 192.168.10.254
!
!
!
line con 0
password 7 080C556D061716181E0E
logging synchronous
login
exec-timeout 6 50
!
line vty 0 4
login
line vty 5 15
login
!
!
end
Lan-Switch3:
spanning-tree mode rapid-pvst
spanning-tree portfast default
!
interface FastEthernet0/1
switchport access vlan 12
switchport mode access
switchport voice vlan 12
spanning-tree portfast
!
interface FastEthernet0/2
switchport access vlan 12
switchport mode access
switchport voice vlan 12
spanning-tree portfast
!
interface FastEthernet0/3
switchport access vlan 12
switchport mode access
switchport voice vlan 12
spanning-tree portfast
!
interface FastEthernet0/4
switchport access vlan 12
switchport mode access
switchport voice vlan 12
spanning-tree portfast
!
interface FastEthernet0/5
switchport access vlan 12
switchport mode access
switchport voice vlan 12
spanning-tree portfast
!
interface FastEthernet0/6
switchport access vlan 12
switchport mode access
switchport voice vlan 12
spanning-tree portfast
!
interface FastEthernet0/7
switchport access vlan 12
switchport mode access
switchport voice vlan 12
spanning-tree portfast
!
interface FastEthernet0/8
switchport access vlan 12
switchport mode access
switchport voice vlan 12
spanning-tree portfast
!
interface FastEthernet0/9
switchport access vlan 12
switchport mode access
switchport voice vlan 12
spanning-tree portfast
!
interface FastEthernet0/10
switchport access vlan 12
switchport mode access
switchport voice vlan 12
spanning-tree portfast
!
interface FastEthernet0/11
switchport access vlan 12
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/12
switchport access vlan 12
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/13
switchport access vlan 12
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/14
switchport access vlan 12
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/15
switchport access vlan 12
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/16
switchport access vlan 12
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/17
switchport access vlan 12
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/18
switchport access vlan 12
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/19
switchport access vlan 12
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/20
switchport access vlan 12
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/21
switchport access vlan 12
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/22
switchport access vlan 12
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/23
switchport access vlan 12
switchport mode access
spanning-tree portfast
!
interface FastEthernet0/24
switchport access vlan 12
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/1
description Connection to Switch1 GigabitEthernet0/2
switchport trunk native vlan 999
switchport mode trunk
!
interface GigabitEthernet0/2
description UNUSED
switchport trunk native vlan 999
switchport mode trunk
shutdown
!
interface Vlan1
no ip address
shutdown
!
interface Vlan10
description classroom 1 and classroom 2
ip address 192.168.10.3 255.255.255.0
!
logging 192.168.10.254
!
!
!
line con 0
password 7 080C556D061716181E0E
logging synchronous
login
exec-timeout 6 50
!
line vty 0 4
login
line vty 5 15
login
!
!
end
Best Answer
First of all, you need to enable
IP routingon your Lan-Switch1, which I do not see in your configuration, then verify the following points:Updated answer:
Below is my setup. Both IP_Phone and PC (in VLAN 12 on Switch1) can get the IP addresses from DHCP server:
I hope it is helpful.