What is the fine-grained topic of the following text: 25 January 2012 - Teligent, the provider of intelligent network, call completion, IVR and charging services to global telcos and operators, has launched its Caller ID Theft Control Server, which secures customer voicemail boxes against hacking with the use of caller ID spoofing apps. Only return the topic.
Launch of Teligent's Caller ID Theft Control Server