Re-IPing Voice

[G3261]

I have given a task to re-IP all the Cisco voice phones from 192.168.x.x addresses to 172.22.x.x addresses. Site has Cisco 3925 router running dhcp pool for the phones. My questions are--

-can I create new dhcp pool (slightly different name than existing one) and this would not create any issues in current environment?

-Is there anyways I can test a single Cisco phone with new IP prior to changing all the phones? How can I do that?

I understand I need to change srst ref. IP in call manager and reset the device pool. Also, once new dhcp pool is ready, I need to do shut.no shut on the switch port.

[balaji.bandi]

yes, you can set up the new IP  DHCP pool and Gateway.  use different VLAN, just make switch port with new VLAN, so the Phone gets a new IP address. in the DHCP pool use your CUCM IP address for the Phone to register. ( so this is not going to affect product network and phones)

Once you have ( either you change the VLAN SVI with new SVI or change the access port to new VLAN ( on  each switch, so you can move them to new IP address)

this high level, you need to consider your network - like any routing or FW rules required for the new subnet to work.

[Nithin Eluvathingal]

Assume the new  subnet as 172.22.10.0/24. I created a vlan 100 and  an SVI with 172.22.10.1 as iP.

Vlan 100

name Temporary 

int vlan 100

ip address  172.22.10.1  255.255.255.0

Gi0/20 is the port which which I am going to connect the phone and test new IP. 

int gi0/20

switchport voice vlan 100

New DHCP subnet 

ip dhcp pool NEW-VOICE

 network 172.22.10.0 255.255.255.0

 default-router 172.22.10.1 

 option 150 ip CUCM IP's.

Before testing the new IP, Reset the network settings from phone setting .