Multiple SubNets -- seems OK ?

Would the below "current flow" cause any issues ?
 1. static 25.x phones on 255.255.252.0 to
 2. static 24.x switches on 255.255.255.0 to
 3. static 24.x firewall on 255.255.252.0 to
 4. outside world customer

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DETAILS

My current Windows DHCP server is running out of IPs,
therefore I was planning to change the SubnetMask from
255.255.255.0 to 255.255.252.0 on 100+ static servers,
routers, VPN tunnels, etc but do NOT have time to
right now, therefore I did the below

1. Changed firewall/router from 255.255.255.0 to 255.255.252.0
2. Reassigned a few dynamic 24.x phones to be static 25.x phones
3. Waited 4 hours today
4. Only got one complaint, therefore phones seem to be OK

At some point I will change the SubnetMask
from 255.255.255.0 to 255.255.252.0 on my other statics
finance_teacherAsked:
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
That will work, as the phones should not have to communicate to the switch or anything else but the router. I take it you don't have an onsite VoIP PBX?
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SStoryCommented:
Example:
172.16.24.0 - 172.16.27.255/22 just expands what is visible as the network portion and covers
24.x to 27x as one subnet.  As long as you don't have x.24/24 (255.255.255.0) and x.25/24, x.26/24, x.27.24 as separate subnets setup in routes there shouldn't be a problem. What you've done is said, give me a subnet from 24.x to 27.x, tell the firewall about it but don't let the switch know the size.  Unless the switch has VLANs or routes I don't know why it would matter for it either. Switches pass by Layer2 unless you have layer3 going on.
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
Yes, forgot to tell about that - Switch is interested only if VLANs are used.
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