A system and method are provided for using Local Number Portability (LNP) and
the
public switched telephone network (PSTN) trunks as virtual loop-around trunks.
Present invention LNP structures and processes redirect calls to avoid the creation
of loop-around trunks from calls generated in the local exchange carrier (LEC)
requiring services such as prepaid caller and calling party pays. A virtual trunk
switch is created using a Switch Control Point (SCP). Telephone numbers requiring
special services are ported and stored in a LNP database. Numbers requiring special
services are flagged with a LRN that identifies a special service switch which
is either an SSP or an SCP. The LRN initiates communication between the local exchange
switch and the special service switch. Once engaged, the special service switch
protocols create the trunk links. By monitoring these trunk links, the special
service switch is able to monitor the in-band communications, and so provide the
special services. Similar processes are provided using the LNP to insert either
a Service Switching Point (SSP) or an Intelligent Peripheral (IP) in the network
trunk to provide services with a fewer number of switch connections.
