Patent ID: 8396444

Claim:
A method of establishing a connection from a Public Safety Answering Point (PSAP) to a terminal subscribed to Intelligent Network (IN) services, comprising the steps of: receiving by the PSAP, a call report with the number of the terminal, wherein the number is a Mobile Station International Subscriber Directory Number (MSISDN); adding a prefix to the calling party MSISDN (collectively, “digits”) to connect the call to the terminal; receiving the digits, via a Base Station (BS) and a Base Station Controller (BSC) in a Visiting Mobile Switching Center (V-MSC); analyzing, by the V-MSC, the digits; routing the call to a Gateway Mobile Switching Center (GMSC) being used by the terminal without stripping or altering the digits; performing B-number (called party number) and Signaling Connection and Control Part (SCCP) analysis at the GMSC, wherein the global title “Routing Case” provides the Signaling Point (SP) of the Home Location Register (HLR); sending the Mobile Application Part (MAP) message “Send Routing Information (SRI)” to the HLR by the Message Transport Part (MTP); receiving, at the GMSC, Terminating CAMEL Subscription Information (T-CSI) data from the HLR wherein the T-CSI data indicates that Customized Applications for Mobile Network Enhanced Logic (CAMEL) services are to be applied to mobile terminating calls and routing to the GSM Service Switching Function (gsmSSF) is invoked; sending a Service Key (SK) from the HLR and data for CAMEL from the gsmSSF to a Service Control Point; identifying the service to be invoked in the SCP; sending, by the SCP, interrogations about parameters associated with the terminal to a Service Data Point (SDP) to determine if a call is allowed and, if so, for how long; and addressing, in an IN platform, an A-number (calling party number) prefix in such a way that SCP always allows the connection of a call with the prefix dialed by the PSAP in the call from the PSAP to a terminal of the IN subscriber.