Is there a way to make encryption call but don't use TLS

don’t use TLS, just make an data encryption call. Any ideas?

RTP can be encrypted with SRTP independently of using TLS. You don’t have to use TLS To use SRTP.

great, it’s my goal, could you give me an example? What should be in sip.conf and extension.conf and how to configure account on Bline or eyebeam? … g+Tutorial

Skip straight to the section on SRTP.