Routing Call To UMA-Capable Terminals Using A Geographic Number

Abstract

Method of routing a call made to a fixed telephone number of a UMA-subscriber in a mobile telecommunications network comprising a first and a second switching node and a location server. Location information of said UMA-subscriber is acquired, wherein said location information comprises a location area code or a combination of location area code and cell identifier associated with a serving BSC or a serving GANC. The call is connected to the UMA-subscriber when the location area code or combination of location area code and cell identifier is associated with one of a group of GANCs, or connected to an alternative destination, such as a voicemail service, if the location area code or combination of location area code and cell identifier is not associated with said one of a group of GANCs.

1 . Method of operating a telecommunication network for setting up a call between first and second WLAN-enabled mobile terminals, said telecommunication network comprising switching nodes, WLAN Access Points (WLAN AP) serving said WLAN-enabled mobile terminals, the method comprising the steps of:
 Inserting, by a first WLAN AP serving said first WLAN enabled terminal, a local media transfer (LMT) indication into a first call establishment message, indicating that media transfer may take place directly with the first WLAN AP;   Receiving, by a switching node, said first call establishment message;   Invoking, by said switching node, a Service Control Entity (SCP) with an Intelligent Network (IN) trigger message including said received LMT indication;   Receiving, by said switching node, an indication that local media transfer is allowed or not from said SCP;   Sending, by said switching node, a second call establishment message, including said LMT indication when local media transfer is allowed;   Receiving, by a second WLAN AP serving said second WLAN enabled terminal, said second call establishment message comprising said LMT indication;   Sending, by said second WLAN AP, a call confirm message including an acknowledge LMT indication when said second WLAN AP agrees to use local media transfer;   Routing, by said switching node, said call confirm message towards said first WLAN AP;   Receiving, by said first WLAN AP, said call confirm message including an acknowledge LMT indication;   Establishing local media transport with said second WLAN AP by said first WLAN AP using said acknowledge LMT indication; and,   Establishing local media transport with said first WLAN AP by said second WLAN AP using said LMT indication;   
     
     
         2 . Method according to  claim 1 , where said first and second WLAN AP are the same WLAN AP. 
     
     
         3 . Method according to  claim 1 , said LMT indication comprising at least one of:
 A Boolean value indicating that local media transfer is offered by said first WLAN AP for this call;   An IP address associated with said first WLAN AP; and,   A port number associated with said first WLAN AP.   
     
     
         4 . Method according to  claim 1 , said acknowledge LMT indication comprising at least one of:
 A Boolean value indicating that local media transfer is accepted by said second WLAN AP for this call;   An IP address associated with said second WLAN AP; and,   A port number associated with said second WLAN AP.   
     
     
         5 . Method according to  claim 1 , wherein said switching node additionally performs the step of:
 Sending an indication to said SCP whether local media transfer will take place between said first and second WLAN AP based on the presence of said acknowledge LMT indication in said call confirm message.   
     
     
         6 . Method according to  claim 1 , wherein said telecommunication network is a GSM or UMTS network. 
     
     
         7 . Method according to  claim 1 , wherein a service control entity (SCP) is in communication with a switching node for setting up a call between a first and second WLAN enabled mobile terminal, said method further comprising the steps performed by said SCP of:
 Receiving an IN trigger message from said switching node comprising an LMT indication related to said call;   Checking if local media transfer can be allowed for said call; and,   Sending to said switching node an indication whether local media transfer is not allowed for said call by removing said LMT indication in an instruction to said switching node.   
     
     
         8 . Method according to  claim 5 , wherein a service control entity (SCP) is in communication with a switching node, said SCP performs the step of:
 Receiving from said switching node an indication whether local media transfer will take place between said first and second WLAN AP.   
     
     
         9 . Switching node of a telecommunications network for setting up a call between first and second WLAN enabled mobile terminals, said WLAN enabled mobile terminal being served by WLAN APs, the switching node connectable to a Service Control Entity (SCP), wherein said switching node is arranged to:
 Receive, from a first WLAN AP serving said first WLAN enabled mobile terminal, a first call establishment message comprising a LMT indication;   Invoke said SCP with an Intelligent Network (IN) trigger message including said received LMT indication.   Receive an indication that local media transfer is allowed or not from said SCP; and,   Send by, said switching node, a second call establishment message, towards a second WLAN AP serving said second WLAN enabled mobile terminal, including said LMT indication when local media transfer is allowed.   
     
     
         10 . Switching node according to  claim 9 , further arranged to:
 Route, by said switching node, a call confirm message, comprising an acknowledge LMT indication, from said second WLAN AP towards said first WLAN AP; and,   Send an indication to said SCP whether local media transfer will take place between said first and second WLAN AP based on the presence of said acknowledge LMT indication in said call confirm message.   
     
     
         11 . Service control entity for an intelligent network which provides intelligent network services to users of a telecommunications network, the service control entity connectable to a switching node, and comprising a processing unit, an input unit connected to the processing unit and an output unit connected to the processing unit, wherein the service control entity is arranged to:
 Receive an IN trigger message from a switching node, said trigger message comprising a LMT indication relating to a call establishment between a first and second WLAN enabled mobile terminal;   Check if local media transfer can be allowed for said call; and,   Send to said switching node an indication whether local media transfer is not allowed for said call by removing said LMT indication in an instruction to said switching node.   
     
     
         12 . Service control entity according to  claim 11 , further arranged to:
 Receive from said switching node an indicating whether local media transfer will take place for said call.