A proton conductive film, a method of producing the proton conductive film, and a highly sensitive humidity sensor are provided. More specifically, the negotiation for the binary SIP transmission can be done by exchanging text-based SIP messages or other similar messages over standard SIP connection channels. In the single-limb configuration, an active or passive exhaust assembly can be provided proximate to the patient. The liquids may be solutions or melts. An angle between axial direction of the main passage and the wall surface is greater than an angle formed between axial direction of branch passage and the wall surface. The method provides increased piracy protection while providing a relatively straight forward process for a user to satisfy a license claim.