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    • To enable TLS set the "Transport" to to as shown below.    

    • To enable SRTP
    • Set Media Encryption to SRTP via in-SDP (Recommended)
    • Set Allow Non-Encrypted Media to No


  • Once the prerequisites are met then you will start by enabling TLS/SSL/SRTP in Asterisk SIP Settings chan_sip ( pjSIP will be covered next.) 
    •  Set "Enable TLS" to "yes"
    • Choose the Certificate to use.  Certificates are setup in Certificate Manager module on your PBX.
    • Set "SSL Method" to use "sslv2"
    • Set "Don't Verify Server" to "No" ( this seems a bit counterintuitive but it is that we want to verify.)