[cisco-voip] phones getting IP from data VLAN

[Erick Bergquist]

Make your access and voice vlan the same, so the port is only in one
VLAN until the phone gets updated off the MFG phone load.

Sample:

switchport access vlan 20
switchport mode access
switchport voice vlan 20 (not needed with this temp config)
spanning-tree portfast

After the phone gets upgraded to your phoneload version, you can
revert the switchport config back to normal config.

switchport mode access
switchport access vlan 10
switchport voice vlan 20
spanning-tree portfast

What type of switch are you using?

I had posted about this issue 3-4 weeks again, as this issue has been
around a very long time with phones shipped out with a MFG load on
them.  It goes back to the early 3.x days from my experience.