Avaya phones go offline when the DHCP server was turned off

[wareemba76]

Hi All, again this may only be for future reference as I tell the story as it unfolds.
We have an telephone environment in which each floor has a separate voice vlan. For this site there is one single DHCP server at a remote office. From what I am told all phones went into discover when the DHCP server was turned off for maintenance purposes. I have been trying to think why, hence would like to share the findings here as we go.

 

[dialtonebone]

Is that DHCP server by some crazy chance doing something MORE than just DHCP? Like maybe bridging a network or something?

 

[gwebster]

What is your DHCP lease time? The phones will try to renew their DHCP a address at half that value.