| 摘要 |
<p>The invention relates to a method and a communication system comprising at least one first network element connectable to a second network element. At least one of the first and second network elements are able to use one of two or more selectable modes for communicating with another network element. One or both of the network elements, or a third network element which is connectable with the first and second network elements, is adapted to perform a mode selection procedure for selecting the same mode for bidirectional communication between the network elements. The modes preferably are different codec types or channel-coding schemes, or radio interface protocol types. The first and/or second network elements may be portable terminal equipments whereas the third network element preferably is a support node or a means providing a support function such as a CSCF. The mode selection ensures the use of one and the same mode such as a codec in uplink and downlink direction and thus enables e.g. IP telephony in UMTS using SIP protocol.</p> |
