PRIVISIP is a TLS/SIP service provided by LOD Communications.
SIP generally utilizes unencrypted UDP transport to establish communication. PRIVISIP provides an encrypted TCP transport for SIP, RTP (rtp), as well as ZRTP support.
We greatly encourage all communication to utilize encryption when available. A PRIVISIP account allows you to both test TLS communication as well as use a TLS proxy for your endpoint, pbx, or other sip device.