Hey Michael,
Have you checked to make sure that DHCP snooping is not turned on on the switch, as well as, check and make sure your operational vlan is being allowed on the trunk.


Thanks,
Amp

Quoting Michael Davis <michaeldavis1...@yahoo.com>:

Scenario for campus intrasture problem:


Phones are not registering. Phones are obtaining a valid IP address and have been erased to ensure they are getting a fresh IP address.

Solutions investigated

Verified VLAN's are correct and active
Verified option 150 is correct in the DHCP options
Verified Helper IP address is on was  the voice vlan's when in different subnet
TFTP and DHCP on CM was restarted.
NTP was verified and CM DB replication is normal.

Idea that not checkd: WAN Qos may have been enabled thereby causing phone registration issues.

Am I on the right track?

Michael Davis



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