Verify that the Inter-Tel phone is negotiating the voice VLAN properly, either via LLDP or by manual configuration to VLAN 192 in your example. It may be using CDP rather than LLDP. CDP is Cisco-proprietary but some vendors such as HP and Polycom (and perhaps Inter-Tel) interoperate with it. Ensure that LLDP is enabled on the switch and the phone. If LLDP is not an option on the phone, you may need to manually configure the phone's voice VLAN to match the switch.
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Looks like i have found the resolutions to this issue. The Inter-tel 8662 and 8622 phones have an issues with LLDP. To fix this on the AOS on the port the phone is connected to run this command:
"no lldp send-and-receive".
This will disable LLDP on the port and allow the phone to complete the DHCP negotiation. Here is an out line of the issue as posted in the Mitel Support forums:
When the phone receives an LLDP frame from the switch, it seems to no longer process DHCP Offers. Similarly, if the phone has an IP address manually set, it will not process ARP Requests.
Disabling LLDP on the switch globally or at the interface level resolves the symptoms.
Root-Cause of Symptoms Theory:
If the Inter-Tel 8622 phone receives an LLDP frame where the sum of the System_Name and System_Description TLVs is greater than 147 bytes, the phone seems to then stops processing DHCP Offers, and never acquires its IP address.