Universal Personal Telecommunication (UPT); Phase 1 (Restricted UPT Service Scenario); Functional Requirements for Dual Tone Multi-Frequency (DTMF) Type UPT Access Devices
英文名称:Universal Personal Telecommunication (UPT); Phase 1 (Restricted UPT Service Scenario); Functional Requirements for Dual Tone Multi-Frequency (DTMF) Type UPT Access Devices