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Phone not showing in Cisco Emergency Responder

We are running Cisco emergency responder 8.5 and have a Cisco WS-C3750-48PS-S Running c3750-ipbasek9-mz.122-55.SE6.bin. Emergency responder is seeing all but one phone plugged into Fa1/0/10. The phone is also not showing up in un-located phones either. That port is configured the same as all other ports. Does anyone have any idea why a particular phone wouldn't populate ER at all? I'm not sure what else to T-shoot. CDP is enabled globally and on that interface.

CDP Information for port:

Device ID: <name removed>
Entry address(es):
  IP address:
Platform: Cisco IP Phone 7912,  Capabilities: Host Phone
Interface: FastEthernet1/0/10,  Port ID (outgoing port): Port 1
Holdtime : 172 sec

Version :

advertisement version: 2
Power drawn: 6.300 Watts
Management address(es):

CV-IDF2-375001#show run int Fa1/0/10
Building configuration...

Current configuration : 138 bytes
interface FastEthernet1/0/10
 switchport access vlan 18
 switchport mode access
 switchport voice vlan 108
 spanning-tree portfast


I am pending someone else move that phone to a different switch interface so I'll report back when I get some information on that.

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