Emergency call back for roaming mobile subscribers

摘要: Whenever a mobile station originates an emergency call connection towards Public Safety Answering Point (PSAP), first switching center (MSC) serving the assigns temporary local directory number (TLDN) to connection. The assigned TLDN is also utilized as calling party (CgPn). Subsequently, whenever roams out of MSC coverage area, data correlating with Mobile Station Integrated Service Digital Network (MSISDN) associated roaming are maintained by if timer has not expired. Alternatively, may communicate second newly request and receive MSC. PSAP requests back in response disconnection original connection, forwards received setup signal using stored MSISDN or new Called Party Number (CdPn).