Dell 3048 and cisco phone

[jrgt51]

I have a Dell 3048 switch.
i have a cisco ip phone.
When i connect the phone to the switch i get an ip address as if it were a computer.
how do i get it to get an ip address for the voice vlan?

config on the switch's port:

port 1/0/1
switchport mode general
switchport general pvid 1001
switchport general allowed vlan add 1001
switchport general allowed vlan add 1990 tagged
voice vlan 1990
voice vlan auth disable


if i connect another device to the switch i get the correct ip address from dhcp.
what i want to do is connect the phone to the switch, and connect a PC/Mac to the phone. phone and computer will have different ip addresses corresponding to their vlan.

 

[bill001g]

A lot of cisco phones use CDP to negotiate this but generally other vendor do not support it. Maybe LLDP will work. Not sure other brands of cellphones use a special option on the dhcp server. They boot into the data vlan get a ip and special option that tells them what the voice vlan tag is and then reboot with that tag set.

You should be able to manually set the tag in the phone

 

[jrgt51]

DHCP needed to first be authenticated to an active directory domain to give out ip addresses.

 

[bill001g]

Then you need to manually set the voice vlan in the phone. It will then send the dhcp request on the proper vlan. There are only so many ways to make this work and if you can not use the ones the phone supports then you can not use the features.