| 摘要 |
<p>An interworking control mechanism for a communication connection between at least two parties located in different networks provides the following functions: a parameter may be added in a signalling towards one party, which interprets the parameter and shows/indicates a message to the user that a media composition change is not possible and thus prevented even if it would be instructed; otherwise, an announcement is sent from the network to the other party being incapable to execute the media composition change to inform the user about the dropping of a media stream; and a negotiation between the network and the terminal device of the party being incapable to execute the media composition change is initiated in order to modify the remaining session streams, such as to rearrange the available bandwidth and possibly to change a codec to a better one.</p> |
