Hi Ralph,
PC's are pacthed into the phones (5212) and then the phones are patched into HP 2650-PWR switches which have a data vlan and a voice vlan. The phones do as you described which is get an IP from the data network, reject it, then find the voice network and DHCP from there.
The default VLAN (1) has no tagged and no untagged ports
The Data VLAN (1001) has all ports untagged
The Voice VLAN (1010) has all ports tagged
The PC's and data servers have no vlan config on them. The servers are just patched into Dell POwerconnect managed switches which are uplinked to the HP switches.
Occasionally the PC's are DHCPing from the MItel switches, they should always DHCP from the windows servers on the data network.
The supplier who installed it all seems to know f-all about it, I might be wrong but I thought the two VLANS would be completely segregated with no routing between them?
Thanks