i have a problem with the phones 7940 which are connected to an "older" switches as 3524XL, 2950-12 etc for a long time . I have two VLANs 830 voice and 810 LAN. There is a problem that in most of the time the phone GETs the address from LAN DHCP server with different range of IP addresses and no through VOICE VLAN from VOICE DHCP.
I haven't got this problem on newer switches like a 3750 or 3550..
I debuged on VOICE DHCP and I saw that there was a BROADCAST request and than a DHCP request but there wasn't DHCP response from VOICE DHCP yet.
switchport trunk encapsulation dot1q
switchport trunk native vlan 810
switchport mode trunk
switchport voice vlan 830
Phone type 7912 doesn't have this problem on the same switch.
Make sure that the switchport configuration for the access/data vlan DHCP server doesn't have:
switchport voice vlan xxxx
I ran into a bug with FW7900 6.0(5) where the phone would obtain an IP from the access/data vlan. I ended up removing the voice vlan from the switchport to the access/data vlan DHCP server and now everything works.
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