Abstract: Local Number Portability (LNP) includes two capabilities: Location Routing Number (LRN) and Message Relay Service (MRS). The LRN capability allows proper call routing during a normal call. MRS allows proper execution of telephone services such as voice messaging and automatic callback. The system and method of the present invention implements LRN and MRS at an ISCP.

Abstract: In the proposed Local Number Portability (LNP) telecommunications network, the traditional link between the first six digits of a ten-digit dialed number and the geographic link of a switch is broken. Some pre-LNP telephone services, however, have been implemented based on this geographic link. For the services to continue to work in an LNP environment, network databases must be simultaneously updated with information reflecting the fact that subscribers have switched from one local service provider to another. If these databases are not simultaneously updated, the possibility for looping messages between network elements arises. The present invention provides a method and system for controlling looping messages between network elements wherein a unique code for each incoming message is generated and stored along with the time the message was received.