Configuring specific DHCP options within same subnet

Hi Fortinet Guru's,

I have a question regarding the DHCP functionality within the FortiOS.

We're asked to replace a CISCO device within a couple of weeks, so far so good. But the Cisco device used DHCP pools to distribute DHCP options for specific desk phone's, within the same subset.

A piece of the config file:

ip dhcp excluded-address 192.168.2.1 192.168.2.9
ip dhcp excluded-address 192.168.2.200 192.168.2.254
!
ip dhcp pool VLAN1
network 192.168.2.0 255.255.255.0 domain-name xxx.local default-router 192.168.2.254 dns-server 192.168.2.254
lease 0 8 !
ip dhcp pool phone1
host 192.168.2.5 255.255.255.0
hardware-address 0004.f269.39d5
default-router 192.168.2.254
dns-server 192.168.2.254 213.144.235.1
option 66 ascii "http://xxx100:xxhoofd75@xxx.nl/dms/polyucauth" lease 0 0 30
!
ip dhcp pool phone2
host 192.168.2.6 255.255.255.0
hardware-address 0004.f269.3d88
default-router 192.168.2.254
dns-server 192.168.2.254 213.144.235.1
option 66 ascii "http://xxx200:xxhoofd75@xxx.nl/dms/polyucauth" lease 0 0 30

It seems FortiOS doesn't have the capability to provide the same functionality; but I need someone to confirm. For instance, if I try to make multiple DHCP servers within the FortiOS config, it will complain about the subnet which cannot be used in multiple DHCP servers.

Who can help me out? Thanks in advance!