The present invention provides a way to associate multimedia clients with telephony devices and create multimedia sessions related to a voice connection between the telephony devices. The overclad extending over the core of the waveguide is thinner and more highly doped that the overclad of the spot-size converter. Advantageously, the shock absorber unit, at the attachment foot, connects to the support by the interposition of mechanical coupling means having a hinge axis which is contained in a plane perpendicular to the rotation axis of the wheel.