Securing UC systems is a tough task. Involves complex solutions. :(
@Manak : Well, Microsoft claims to have obtained third-party audits and certifications which are listed on this site.
Is there any specific sec concern?
Is online service of SFB secure?
@John SRTP is used to encrypt media traffic in Lync\SfB environment... TLS\MTLS is used during communication with foreign (PSTN etc) element.
What encryption technique is used when a audio/video call session is established in SfB/Lync?
"Unified Communications (UC) platform operates in real time, which means it needs to be secured in real time."
THE MOST RELEVANT SENTENCE!!!
Comprehensive and thoughtful!