ESN - Emergency Service Number

Identifies the default Emergency Service Number that determines the PSAP to which the call will be routed should an ANI failure occur.

NOTE 1: The default ESN is provided to the requestor by the local 911 Emergency short cut dialing used to contact police departments for dispatch of officers,fire fighters, or ambulances. The system identifies the caller’s location and otherpertinent information to dispatch accurately. jurisdiction that has agreed to handle their traffic Originating traffic (OT) is one way trunking from an ILEC to a CLEC. Terminating traffic (TT) is one way trunking from a CLEC to an ILEC. OT/TT is two way traffic between a CLEC and an ILEC..

NOTE 2: The default ESN may be provided to the customer by the 911 System Service provider in advance of the submission of the Access Service Includes service and facilities provided for the origination or termination of InterLATAor foreign telecommunications. Request.

VALID ENTRIES:

Valid Default ESN numbers

NOTE 1: Default ESN numbers should be zero filled when entered on the ASR Access Service Request.

USAGE: This field is conditional.

NOTE 1: Required when the PSAP field is populated, otherwise prohibited.

DATA CHARACTERISTICS: 5 numeric characters

EXAMPLE: 0 0 0

 0 1

NOTE 1: This example indicates a valid 3 character ESN and it should be zero filled.

 0 1 0 1 2

NOTE 1:  This example indicates a valid 4 character ESN and it should be zero filled.