The videophones were integrated within large public videophone booths, with two booths provided per city. There were several early videophones and cameras that included communication capability. The clients must apply to the integration agency for videophones and funds. Another protocol used by videophones is H.324, which mixes call setup and video compression. The district has completed a $368,845 safety upgrade project which included videophones for building-access. Some early videophones employed very low data transmission rates with a resulting poor video quality. Videophones that provide equal access for Deaf employees are not permissible under NMCI regulations. In the 1960s and 1970s, such exhibits usually included videophones.