The phone is connected to a hub, which is connected to a supported switch port, but it does not support Cisco Discovery Protocol (CDP). Cisco Emergency Responder can consistently discover CDP-enabled phones attached to hubs (which are attached to supported switch ports), but cannot always track non-CDP phones attached in this manner. For non-CDP phones, ensure the phones are attached directly to supported switch ports.
The switch to which the phone is connected is currently unreachable. For example, it does not respond to Simple Network Management Protocol (SNMP) queries. This can be for several reasons:
There is a network outage preventing communication between the Cisco Emergency Responder server and the switch. Locate and resolve the network outage problem.
Unreachable switches are not retried until Cisco Emergency Responder runs the next full switch-port and phone update process, unless you run it against the individual switch.
The phone has moved to a switch served by a different Cisco Emergency Responder group. If this is the case, the Cisco Emergency Responder group name is shown for the phone in the unlocated phones list. If the phone is not locatable in the next incremental phone tracking process after it is moved, the phone remains unlocated in any Cisco Emergency Responder group until a full switch-port and phone update process is run.
The phone requires CAM-based tracking, but CAM-based tracking is not enabled on the switch to which the phone is connected. Cisco IP SoftPhone and some other phone models require CAM-based tracking.