icies, structure, and the responsibilities of study groups. WTSA is also respons- ible for appointing chairs and vice-chairs and approving any programs during their appointment. Telecommunication Standardization Advisory Group (TSAG): Reviews program priorities, financial matters, and strategies for the sector. It coordinates between study groups and provides guidelines and organizational working procedures for them to follow. The TSAG also provides advice and necessary assistance to the director of the Telecommunication Standardization Bur- eau (TSB). The TSB acts as a secretariat to the ITU-T Sector and provides support to coordinate and manage the study groups and maintains the publication records for recommendations. The study groups are the heart of the ITU-T. The SGs are responsible for doing the actual work developing standards in different areas of interest. Each of the study groups is further divided into numerous questions (up to 20 per study group) that tackle specific areas of technology. Some of the study groups in this sector are as follows: SG2: Operational aspects of service provision and telecommunications management SG2 is the home for defining E.164, the numbering standard that provides structure and func- tionality of telephone numbers. SG2 also worked on electronic numbering (ENUM), an Internet Engineering Task Force (IETF) protocol for entering E.164 numbers into the Internet Domain Name System (DNS). SG3: Tariff and accounting principles including economic and policy issues related to telecom- munications SG3 is responsible for studying international telecommunication policy, economic issues, tariff- ing, and accounting matters, and defining regulatory models and frameworks. SG5: Environmental and circular economy SG5 is responsible for studying the effect of ICT on climate change and publishing guidelines for using ICT in an ecologically responsible manner. SG9: Broadband cable and TV SG9 develops standards on voice, video, and data IP applications over cable TV networks. This includes cab