Patent attributes
Methods among nodes of a computer network for establishing a connection between the server and the client. A client node sends a session-invitation message to a server node. The session-invitation message is a message in a first protocol that establishes a channel at the level of the first protocol between the client and the server according to parameters of the session-invitation message that specify characteristics of session in a second protocol. An intermediary node of the network adding new information to the session-invitation message requesting modification of the session policies, and transmits the session-invitation message to the server node. The server receives the session-invitation message, and sends a provisional response back to the client, and holding in abeyance a success or failure response to the session-invitation, without establishing a channel at the level of the first protocol if no such channel is previously established, and without disrupting a channel at the level of the first protocol if such channel has been previously established. When the client receives the provisional response, it reconfigures the characteristics of the session of the second protocol, and sends an amended request to the server. When the server receives the amended request, the server sends a success or failure response to the client, the content of the response being based at least in part on the amended session-invitation, and being of a form defined in the protocol as being an appropriate response form for reply to the original session-invitation message.
