VoIP phones with DHCP

How does DHCP work with VoIP phones?  Do they phones need to get restarted every time the DHCP lease expires?  Or it works no different than a regular computer client?
For the first time phones need to be booted to obtain IP addresses.  Also when DHCP or DNS server changes.  What about a regular DHCP refresh at the end of the lease duration?
We use Polycom ip phones over poe.
Please advice.
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atlas_shudderedSr. Network EngineerCommented:
DHCP process is the same regardless of end device being used.  

When you build DHCP, you can do one of either three things:

1.  Allow DHCP to manage with your normal settings (DHCP is built to confirm address availability prior to assignment)
2.  Set the lease to a never expire option
3.  Build static address assignments for the phones

My org manages around 2500 phones and we use option 1 unless behind a firewall denying ICMP.

Any changes to the pool that would impact device connectivity would require a reboot if changes are to take effect or have affect immediately.

Otherwise, phones will renew/re-register only while the device is not in use and generally only have a built in timeout is reached.
Andy BartkiewiczNetwork AnalystCommented:
should be the same as any other IP device
Tiras25Author Commented:
Got it.  So no difference than any computer, or other IP device.
Thanks guys.
atlas_shudderedSr. Network EngineerCommented:
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