ICX 7150 48P - VoIP Phones

[giorgio_sacchi]

Good morning,
I have 2 ICx 7150 switches in stack.
This is my config


Current configuration:
!
ver 08.0.80dT211
!
stack unit 1
  module 1 icx7150-48p-poe-port-management-module
  module 2 icx7150-2-copper-port-2g-module
  module 3 icx7150-4-sfp-plus-port-40g-module
  stack-port 1/3/1 1/3/3
stack unit 2
  module 1 icx7150-48p-poe-port-management-module
  module 2 icx7150-2-copper-port-2g-module
  module 3 icx7150-4-sfp-plus-port-40g-module
  stack-port 2/3/1 2/3/3
stack enable
stack mac d4c1.9e26.4c9b
stack suggested-id 1
!
!
!
!
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vlan 1 name DEFAULT-VLAN by port
!
vlan 100 name XXX by port
 tagged ethe 1/1/25 ethe 1/1/37 to 1/1/48
!
vlan 105 name XXX_VOIP by port
 tagged ethe 1/1/48
 untagged ethe 1/1/25
!
vlan 125 name XXX_MANAGEMENT by port
 tagged ethe 1/1/48
 untagged ethe 1/1/37 to 1/1/46
!
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aaa authentication web-server default local
aaa authentication enable default local
aaa authentication login default local
aaa authentication login privilege-mode
enable super-user-password .....
hostname XXX_SW01_LAB
ip address 172.31.253.241 255.255.255.0
ip default-gateway 172.31.253.254
!
username admin password .....
cdp run
fdp run
!
!
clock timezone gmt GMT+01
hitless-failover enable
!
!
sz active-list 192.168.100.192 83.216.184.111
!
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lldp run
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end


I have 3 VLANs
100 - Date
105 - VoIP
125 - MGMT

On the 1/1/25 port (Vlan 105) I attached a VoIP phone (SNOM) that correctly takes an IP
In fact, through the "sh lldp neighbors" command I see it



How can I make the other phone's port release an IP of the VLAN 100 to be able to connect a PC (The Dual-Mode command is disabled)? 

Thank you