| 摘要 |
A method of modifying a call set up message for a call from a first terminal to a second terminal, the call set up message being sent from the first terminal (Mobile Station, MS) to a network node (e.g. MSC server, MSC-S) via an intermediate node (e.g. BSC or RNC) which handles at least some signaling or traffic associated with the call, wherein the network node is responsible for negotiating call set up requirements, the method comprising the steps of : intercepting the call set up message at the intermediate node (indicating codec list); identifying one or more codec preferences and capabilities associated with the intermediate node; modifying (e.g. by appending, removing, deleting, inserting or reordering the list) the call set up message based on information relating to said preferences or capabilities; and sending the modified call set up message to the network node. |
