Patent ID: 7327736
Filing Date: 2008-02-05
Classification: H04L

Abstract:
1. A method comprising: establishing a channel to a connection, where the channel established to the connection comprises at least a part with a first interworking function at a first end and a second interworking function at a second end; detecting in the first interworking function that a channel capability of the channel established to the connection must be changed; transmitting to the second interworking function a first message which indicates a desired capability change for the channel established to the connection; checking in the second interworking function whether the desired capability change can be performed in response to the first message; and if the capability can be changed into the desired one: transmitting a second message to the first interworking function, which message indicates that the desired capability change of the channel established to the connection can be performed at the second end; transmitting a third message to the second interworking function, which message indicates that the desired capability change can be performed at the first end; changing the capability into the desired one at the first end; and changing the capability into the desired one at the second end only in response to the reception of the third message.