RouterA#configure terminal

https://www.packettracernetwork.com/tutorials/voipconfiguration.html
RouterA>enable
RouterA#configure terminal
RouterA(config)#interface FastEthernet0/0
RouterA(config-if)#ip address 192.168.10.1 255.255.255.0
RouterA(config-if)#no shutdown

RouterA(config)#ip dhcp pool VOICE #Create DHCP pool named VOICE
RouterA(dhcp-config)#network 192.168.10.0 255.255.255.0 #DHCP network network 192.168.10 with /24 mask#
RouterA(dhcp-config)#default-router 192.168.10.1 #The default router IP address#
RouterA(dhcp-config)#option 150 ip 192.168.10.1 #Mandatory for voip configuration.

RouterA(config)#telephony-service #Configuring the router for telephony services#
RouterA(config-telephony)#max-dn 5 #Define the maximum number of directory numbers#
RouterA(config-telephony)#max-ephones 5 #Define the maximum number of phones#
RouterA(config-telephony)#ip source-address 192.168.10.1 port 2000 #IP Address source#
RouterA(config-telephony)#auto assign 4 to 6 #Automatically assigning ext numbers to buttons#
RouterA(config-telephony)#auto assign 1 to 5 #Automatically assigning ext numbers to buttons#


SwitchA(config)#interface range fa0/1 – 5 #Configure interface range#
SwitchA(config-if-range)#switchport mode access
SwitchA(config-if-range)#switchport voice vlan 1 #Define the VLAN on which voice packets will be handled#

RouterA(config)#ephone-dn 1 #Defining the first directory entry#
RouterA(config-ephone-dn)#number 54001 #Assign the phone number to this entry#

RouterA(config)#ephone-dn 2 #Defining the first directory entry#
RouterA(config-ephone-dn)#number 54002 #Assign the phone number to this entry#

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