I am setting up an office with several IP phones. I 7941s, 1 7960 and one 7920. I have set the same system up at 3 of our other offices and everything has worked fine. The 7941s get DHCP fine, but the 7920 and 7960 do not. I have tried different ports on the switch and have verified that the port the 7960 is connected to is working using the 7941. I have verified the DHCP on the wireless for the 7920 by setting the SSID on a computer for the voip network and it gets an IP address. My router trunked to the switch and I have an IP helper set up on the voice vlan interface pointing to my server on the native vlan. Anybody have an idea why this isn't working?