| 摘要 |
A communication system comprises user end points, a network, and an intermediate end point, the user end points being connected to the network via different link-layers. A session is invitated by a first user with a second user by means of an invitation signal from the first user over the network. The invitation is received by an intermediate point in the network, which allocates an invitation identity to the invitation. The intermediate point then forwards the invitation together with the invitation identity to the second user over the network. The second user receives the information about the invitation together with the invitation identity, and selects end point and/or access configuration for responding to the session invitation. The second user then responds to the request with the selected end point and/or access configuration by appending the invitation identity. The intermediate point associates the response with said invitation signal and establishes the session.
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