NSA Offers Tips on Securing Unified Communication Channels and voice/video over IP calls from cyberthreats. Attackers can exploit vulnerabilities in unified communication systems, such as instant messaging, email, SMS and fax, along with VVoIP applications, to access sensitive communications. NSA recommends separating UC/VVoIP systems and data systems on different networks. Organizations whose perimeters now extend to the cloud are particularly susceptible to DDoS and vulnerabilities caused by misconfigurations, the NSA points out.”]
Source: https://www.govinfosecurity.com/nsa-offers-tips-on-securing-unified-communication-channels-a-16905