Telephone caller location data retrieval

DETAILED DESCRIPTION In FIG.
1, a telephone system is shown that employs an AIN 100.
The AIN 100 is a telecommunications switching network that utilizes the well-known SS7 protocol to connect switching centers and other telecommunications resources to provide call routing and various other services.
Essentially, the AIN 100 is a collection of telecommunications components and interconnections that support the generation of AIN messages known as triggers and enable the components to respond to generated triggers by generating responsive messages or by executing an associated instruction.
A conventional voice line telephone 102 is connected to the AIN 100 through a telephone line 120.
Telephone line 120 leads to a Central Office 104 that maintains a switch known as an SSP 106.
The SSP 106 may have a plurality of subscriber lines connected to it, such as the telephone line 120 establishing wireline telephone service.
Likewise, a voice line telephone or other voice line capable device such as a computer 118 may be linked to another central office 108 and SSP 110 through a telephone line 128.
The AIN can have an indefinite number of SSPs 106, 110.
The SSPs 106, 110 communicate with each other over an SS7 protocol data communication link 122 which may be established through an STP, such as but not necessarily STP 112, which routes the data packets between the SSPs 106, 110.
AIN messages may be passed between SSPs 106, 110 through the communication link 122, and these messages may include data such as the calling party's telephone number or other identifier.
Voice connections between SSPs 106, 110 are established through a voice trunk 130 which carries the voice communication that occurs between the two end devices 102, 118.
A data communication link 124 is used to connect an SSP 110 to an STP 112.
The STP 112 selects an appropriate SCP 114 to route the message from the SSP 110, such as in relation to the calling party's identifier.
Messages are delivered from the STP 112 to an appropriate SCP 114 through a data communication link 126