The Lazy Networker

Here i am going to explain how to setup a small VoIP lab in latest packet tracer.

Network Topology

Configurations

1.DHCP & Interface configurations in C2811

!
hostname CME
!
ip dhcp pool DATA
network 10.1.10.0 255.255.255.0
default-router 10.1.10.254
ip dhcp pool VOIP
network 10.1.20.0 255.255.255.0
default-router 10.1.20.254
option 150 ip 10.1.20.254
!
interface FastEthernet0/0
no ip address
duplex auto
speed auto
!
interface FastEthernet0/0.10
encapsulation dot1Q 10
ip address 10.1.10.254 255.255.255.0
!
interface FastEthernet0/0.20
encapsulation dot1Q 20
ip address 10.1.20.254 255.255.255.0
!
end

2.CME Telephony configuration in C2811

CME(config)#telephony-service             #telephony service
CME(config-telephony)#max-ephones 5 #maximum number of phones
CME(config-telephony)#max-dn 5        #maximum number of telephony numbers
CME(config-telephony)#ip source-address 10.1.20.254 port 2000  #source IP address
CME(config-telephony)#auto assign 4 to 6  #ext numbers to buttons
CME(config-telephony)#auto assign 1 to 5  #ext numbers to buttons

3.Phone directory for phones

CME(config)#ephone-dn 1       #directory entry
CME(config-ephone-dn)#number 54001                #phone number to this entry
!
CME(config)#ephone-dn 2         #directory entry
CME(config-ephone-dn)#number 54002                #phone number to this entry

4.Voice VLAN configuration 

hostname S1
!
vlan 10
name DATA
vlan 20
name VOIP

!

interface FastEthernet0/1
switchport mode trunk
!
interface FastEthernet0/2
switchport access vlan 10
switchport mode access
switchport voice vlan 20
spanning-tree portfast
!
interface FastEthernet0/3
switchport access vlan 10
switchport mode access
switchport voice vlan 20
spanning-tree portfast
!

Verification

Try to call from one phone to another 🙂 🙂 If you have any doubt please reach out to me