# L2 to CESID Mapping

## Purpose

The L2 to CESID Mapping form is used to assign a Customer Emergency Services ID (CESID) number to a Layer 2 switch port. The CESID is sent to the Public Safety Answering Point (PSAP) in the event of an Emergency Call and used as a key in the Automatic Location Information (ALI) database to pinpoint the precise location of the caller.

Refer to the CESID Programming instructions.

NOTE: Importing into the L2 to CESID Mapping form should be done in blocks of 1000 entries or fewer.

## Conditions

WARNING: MiVoice Business 6.0 supports CESIDs up to 12 digits in length. This may have safety (and legal) implications in networks of older releases which only support 10-digit CESIDs. If you plan to use the longer CESIDs, you are strongly advised to upgrade the entire network to support the longer CESIDs first. Failure to do so could lead to emergency calls having incorrect CESID information in certain cases. For example, consider a hot desk user who is provisioned on a MiVoice Business system that uses 12-digit CESIDs who then logs in using a DN on a 10-digit MiVoice Business system. Because a hot desk DN uses the CESID assigned to the registration (login) DN for emergency call purposes, such calls will contain an incorrect CESID: instead of 12 digits, it will have only 10 (the last two are truncated) and the emergency route preference used will be "Through System Only," although the registration DN preference may be something else. The same scenario applies to resilient devices. Both the primary and secondary MiVoice Business system should be upgraded to avoid mismatched CESID lengths under failover/failback conditions.

## Field Descriptions

Parameter | Description | Default
L2 Port MAC/Chassis ID | Displays the MAC address of the Layer 2 switch port of the L2 switch. The MAC address of the Layer 2 switch port is detected by system when the IP phone registers. You can also manually assign an L2 switch port MAC address during an Add operation, but not during an Edit operation. | Blank
L2 Port | Displays the identifier of the Layer 2 switch port. The L2 port identifier is detected by the system when an IP phone registers. You can also manually assign a L2 switch port identifier during an Add operation, but not during an Edit operation. | Blank
CESID | Enter the CESID to be sent to the PSAP in the event of an emergency call. Up to 12 digits can be programmed. (CESID numbers do not apply to Hot Desk user DNs. The system uses the CESID associated with the hot desk set (i.e., the registration DN) regardless of which profile—set or user—is active on the phone.) See the above Warning for important information regarding CESID length in a mixed release network. | Blank
L2 Label | Displays the location of the access point. Supports up to 21 alphanumeric characters. | Blank

Related Topics

- Emergency Services Description

- Emergency Services - CESID programming