CITIC Telecom International Holdings Limited, an investment holding company, provides telecommunications services worldwide. The company provides carrier services, such as mobile roaming signaling SCCP, single IMSI multiple number, pre-paid roaming, MVNE, GMVNO, USSD, IP packet exchange, and short message service (SMS) firewall; Internet services; and international voice services, including voice hubbing service in handling roaming service for mobile and fixed line operators and data roaming services for mobile operators; SMS services; datamall; big data; and Internet of Things services. It also offers enterprise solutions, including network connectivity, data center, cloud computing, information security, enterprise mobile services, and voice and information services; and Internet-based communication services, such as Communication Platform as a Service for handset manufacturers and OTT operators.