Abstract: A device and method for preparing an aligned carbon nanotube (CNT) fiber through electrochemical stretching. The method comprises: constructing an electrochemical reaction system by using an original CNT fiber as a working electrode stretching, a counter electrode, a reference electrode, and an electrolyte, applying a selected stretch stress to the original CNT fiber for electrochemical stretching while powering on the electrochemical reaction system so that ions in the electrolyte are embedded into the original CNT fiber, and the orientation of the carbon nanotube is generated due to the action of the stretch stress under the state of expansion; and powering off the electrochemical reaction system while maintaining the application of the selected stretch stress, so that the ions in the electrolyte are released, thereby obtaining a highly aligned CNT fiber.

Abstract: A method of controlling an establishment of a multimedia call between at least two communication equipments, a corresponding system, and a corresponding communication equipment comprise a set up of a bearer connection resulting in a creation of a data transmission channel between at least two communication equipments. A data stream is transmitted between the at least two communication equipments after the creation of the data transmission channel for maintaining synchronization of the data transmission channel. Predefined information elements are introduced in the data stream, wherein the predefined information elements indicate local protocol settings for the multimedia call. The predefined information elements are recognized from the data stream, and parameters of an application protocol used for the multimedia call are adjusted on the basis of the predefined information elements.

Abstract: A method of controlling an establishment of a multimedia call between at least two communication equipments, a corresponding system, and a corresponding communication equipment comprise a set up of a bearer connection resulting in a creation of a data transmission channel between at least two communication equipments. A data stream is transmitted between the at least two communication equipments after the creation of the data transmission channel for maintaining synchronization of the data transmission channel. Predefined information elements are introduced in the data stream, wherein the predefined information elements indicate local protocol settings for the multimedia call. The predefined information elements are recognized from the data stream, and parameters of an application protocol used for the multimedia call are adjusted on the basis of the predefined information elements.