[cisco-voip] Cisco IP phone and infinite DHCP lease

[Scott Voll]

at my old place of employment we did it because the 1/2 life of DHCP would
cause a short outage on the phones due to the renewing of the DHCP address.
 Thus we moved to a infinite lease time.  But we then upgraded software
hardware and in the process needed to change IP's on the CM servers.

So we needed to change the lease time to something we could easily migrate
the day of the upgrade which was 1 day.

--Scott

On Wed, Oct 12, 2011 at 8:51 AM, Stephen Welsh
<stephen.welsh at unifiedfx.com>wrote:

> Interesting problem,
> I wasn't aware of many people setting an infinite DHCP lease, I assume this
> is to prevent from the impact of a loss of DHCP server?
>
> I suspect if you go to the phone settings and erase the phones config that
> will force the phone to re-aquire an IP Address?
>
> If that worked it would give you the option of using a key press macro and
> sending the key sequence to the phones remotely, or asking users to perform
> the sequence for you.
>
> This would only apply to the normal IP Phones, the ATA's would need to be
> done separately, possibly web browse into each one?
>
> Thanks
>
> Stephen
>
> On 12 Oct 2011, at 15:34, Anthony Kouloglou wrote:
>
>  Hi Scott,
> if all we need is shut no shut it is bearable.
> What is not bearable is unplug and replug (all devices are non poe) of
> their powercube :-(
>
> Regards
> Anthony
>
>
>  On 12-Oct-11 17:30, Scott Voll wrote:
>
> it's been too long ago for me to be sure.... but I think when we moved to
> new CM hardware and changed IP's this is what we did...... BUT I think I did
> a shut no shut on the switches.
>
>  Scott
>
> On Wed, Oct 12, 2011 at 6:56 AM, Anthony Kouloglou <akoul at dataways.gr>wrote:
>
>>  Hi all,
>> suppose a ip phones (79XX, ATA186, ATA187, 69XX) are registered to a CUCM
>> and the dhcp has assigned them an infinite IP.
>> If i disable this dhcp and set up a new one with different lease time (a
>> day for example), will the ip phones get the new settings after i reset them
>> from the CCM admin?
>>
>> Regards
>>  Anthony
>>
>>
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