Patent ID: 7242943

Claim:
A method, comprising: establishing a connection in a telecommunication network comprising different protocols, and an interworking function for adapting the different protocol features used for a connection between a calling terminal and the interworking function, and the interworking function and the called terminal; receiving at the interworking function from a calling terminal a request to establish a connection of a first type (multimedia connection) using first protocol features; performing a setup processing according to the first protocol features used for the first type of connection between the interworking function and the called terminal; determining a second type of connection; checking the result of said setup processing so as to indicate whether or not the setup processing according to the first protocol features has been successful; and, when said checking indicates that said setup processing was not successful, establishing said second type of connection between the interworking function and the called terminal and changing the connection between the calling terminal and the interworking function to the second type of connection.