OmniSound Full duplex broadband sound technology Management of up to 4 external participants Recording range up to 30 m room area or 10 participants Simultaneous management of internal and external telephone listings (LDAP) Connection type for add-on microphones for a larger recording range.Microsoft Office Communication server 2007 R2 ready. Multiple SIP registrations. Broadband quality by G.722. Security: OpenVPN, SIPS/SRTP, TLS, SIP RFC3261. NAT: STUN, ICE.