Encryption possible for non-TLS phones?

We set up a system using Asterisk 13 and SIP phones that happen not support TLS, they have proprietary encryption. We are able to get every major function working except secure calling, is it still possible through other means?

Asterisk only supports open encryption standards. You would need to use a proprietary gateway from the same vendor.

If I don’t know what encryption standard the phone uses, what can I run to see whether Asterisk will support it or not? I just want to make sure that I can’t get it to work because the phone won’t support it, not because there’s something I overlooked or haven’t tried. Thanks!

Asterisk supports SDES-SRTP and DTLS-SRTP.

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