Added functionality that allows for encrypted RTP audio communications between SIP devices, known as SRTP (RFC-3711). SRTP works in conjunction with the TLS protocol for SIP traffic to secure all communications to and from the phones. ZRTP (RFC-6189) is not supported.

Enabling TLS AND SRTP

Enable SRTP

SRTP at this time must be enabled by support. Please contact support and request SRTP to be enabled including the domain name.

Enable TLS from Portal

The TLS transport protocol may be enabled by either editing the Phone Hardware from the Inventory or from within the Button Builder from the Additional phone settings by changing the Transport Method. 

   or..