and are prioritized. The following list provides an overview of these various transactions and the major steps they encompass. - Pre-ordering - Pre-ordering includes customer service record retrieval, service reservation, number reservation and service availability confirmation. - Local service requests (LSRs) - LSRs are exchanged between a service provider and an incumbent LEC (ILEC). They are the forms and processes used to switch voice customers from one IIC to another. LSRs are, for the most part, standardized, with small variations from ILEC to ILEC. - Access service requests (ASRs) - ASRs are exchanged between service providers and network providers. They are used to order facility circuits and other high-capacity, unbundled network elements or services. ASRs are also standardized, perhaps more SO than LSRs. - Order status - Users should have access to all kinds of order-related information, from when the order will be filled, any problems that might The Ultimate Guide to Building and Delivering OSS/BSS have occurred and delayed fulfillment to who's responsible for seeing it completed. - LIDB/CNAM - Updates customer information and settlements databases. For example, when a customer switches from one IIC to another, his long distance billing must be redirected to the proper service provider. Particularly for resellers, network databases must be updated to reflect who owns which customer, regardless of the fact that various customers' traffic runs over the same network. Local number portability (LNP) - When a customer changes providers and keeps his or her phone numbers, updates must be sent to a local number portability database. Telephone numbers are no longer attached to switches or ports. The network uses an LNP database as reference for where to deliver traffic when a ported number is dialed. IICs offering voice services are legally required to support LNP. - E-911 - Emergency record information for local databases must be updated any time a customer changes providers, telephone numbers and addresses. -