Without the Emergency Calls from Unnamed IP Endpoints feature, if a user of an IP telephone registers the extension to another telephone or softphone, the IP telephone changes to an unregistered state. The IP telephone cannot reregister until the user releases the extension number from the other telephone or softphone. A user cannot use an IP telephone that is in an unregistered state to make emergency calls.
However, if a user has a DCP telephone and registers the extension to another telephone or softphone, the DCP telephone goes into a dissociated state. In this state, a user can still use the DCP telephone to make emergency calls if Communication Manager is appropriately administered.
The Emergency Calls from Unnamed IP Endpoints feature makes IP telephones work like DCP telephones when users make emergency calls from telephones that do not have extension numbers.
When an IP telephone is plugged in, power cycled, or after a user logs off, the system displays a prompt on the telephone display. The prompt asks the user for an extension number and a password. If a user does not dial at least one digit within 60 seconds from when the system displays the first prompt, the system registers the telephone into TTI service.
If a user wants to make an unnamed IP telephone reregister with an extension, the user must either:
Press the Login prompt on the telephone softkey, and then enter an extension and a password
Use the Feature Access Code (FAC) for the Personal Station Access (PSA) Associate feature
A user can dial the FAC for the PSA Associate feature from an IP telephone that is in TTI service only if one of the following conditions is true:
the Receive Unencrypted from IP Endpoints field on the Security-Related System Parameters screen is set to
The telephone encrypts signaling
If a user dials the FAC for the PSA Disassociate feature, the system immediately places the IP telephone into TTI service.
The Emergency Calls from Unnamed IP Endpoints feature does not work with the following IP telephones:
Non-AVAYA H.323 IP telephones
IP Softphone release 5 or earlier
IP telephones with 2.1 firmware or earlier
IP telephones with 2.5 firmware
The Emergency Calls from Unnamed IP Endpoints feature supports the following capabilities:
If a person makes a call from an IP telephone that is in TTI service, the called party sees the IP port of the calling party and the words TTI port on their display telephone. For example, a called party might see S00001 TTI port on their display telephone. Using this display, the called party can identify the source of the call.
If the Malicious Call Trace (MCT) feature traces an IP telephone that is in TTI service, the MCT controller displays the IP port. The administrator can use the display portn command to convert the port into an IP address. The administrator can then learn the original extension of the IP telephone, and where the telephone is located.
These two capabilities are especially helpful to trace calls.
The system can register an IP telephone to TTI service only if that IP telephone has an IP address that is administered on the IP Address Mapping screen.
The system displays the IP address of an IP telephone that is in TTI service in the Identification field on the Port Information screen.
