The invention relates to a method for setting up a communication connection via an Internet Protocol network from a first terminal of a telecommunications network to a second terminal of an IP subscriber. The segment-type friction material further comprises oil grooves each having an outer peripheral opening portion extended in a curved shape or a linear shape. Another user satisfied with the offered exchange accepts the offer, and the account balances of the two users are adjusted. Examples of safety enhancing devices include, but are not limited to a flag, a sign, a safety tape holder, a light, or other safety-enhancing device. The circuit substrate has an opening that corresponds in position to the cavity. A DNA construct that encodes, upon expression in a plant cell, a fusion protein comprising a cholera toxin A2 subunit, a multimeric cholera toxin B subunit, a first immunogenic antigen from a causal factor of a mammalian disease, and a first immunogenic antigen from a causal factor of a mammalian disease.