... 2048 10 Picocell Low range outdoor Microcell Then the question of the transmission range for UTMS services, is no longer just what transmission rates, but what type of services, when and where. ... Undoubtedly, SIP is poised as the most appropriate protocol to enable PS video teleph-ony in UTMS. At this writing, technical bodies are debating the final outcome. From the author’s point...