Abstract: A method and core network node for establishing a connection between a first access node and a second access node. The first access node sends to a first core network node, a connection establishment request that includes a set of framing protocol parameters for the framing of information to be sent over an interface between the first access node and the first core network node. The first core network node stores the parameter set and initializes a connection to a further core network node according to the framing protocol. If the further core network node is not connectable to the second access node, connections are successively made to additional core network nodes until reaching a final core network node connectable to the second access node. The final core network node initializes the connection to the second access node, which stores the parameter set. The connection is then established between the first access node and the second access node utilizing the parameter set.

Abstract: Whenever a mobile station originates an emergency call connection towards a Public Safety Answering Point (PSAP), a first mobile switching center (MSC) serving the mobile station assigns a first temporary local directory number (TLDN) to the call connection. The assigned TLDN is also utilized as the calling party number (CgPn). Subsequently, whenever the mobile station roams out of the first MSC coverage area, the data correlating the first TLDN with the Mobile Station Integrated Service Digital Network (MSISDN) number associated with the roaming mobile station are maintained by the first MSC if a timer assigned to the first TLDN has not expired. Alternatively, the first MSC may also communicate with the second MSC newly serving the mobile station to request and receive a second TLDN associated with the second MSC.

Abstract: When establishing an emergency call connection towards a Public Safety Answering Point (PSAP) terminal for a mobile subscriber, instead of transmitting the Mobile Station Integrated Service Directory Number (MSISDN) assigned to the mobile station, a directory number assigned to the serving mobile switching center/visitor location register (MSC/VLR) is transmitted as the Calling Party Number. The MSISDN number is stored into the Generic Address Parameter (GAP) within the transmitted Initial Address Message (IAM) signal. When the PSAP attempts to call back the mobile station in response to a disconnection of the original emergency call connection, the PSAP transmits another IAM signal with the received MSC directory number as the Called Party Number. Once the setup signal is routed to the serving MSC/VLR, an application module within the serving MSC/VLR extracts the MSISDN from the GAP to call back the proper mobile station.