We support ZRTP which is SRTP based on all calls, but instead of using SIP to exchange keys, we exchanges keys within the media stream itself making it more secure. Each call automatically negotiates secure connections with endpoints that support the protocol. Currently, ZRTP is integrated into a few softphones, and is also available as an intermediary client application that intercepts your softphone's media and negotiates key exchange with any ZRTP enabled endpoint.
Using ZRTP, two devices can securely exchange encryption keys even over an inherently insecure communication channel.
Please Note: Each sip device will need ZRTP enabled for ZRTP to work. Please check your sip phone config for this option.
ZRTP is enable by default (true).
If you use Boogo to Boogo, you are guaranteed ZRTP encryption.