When I dial 9664 to test the tls/srtp configuration it says that the call is secure, however, when I dial another phone configured for tls/srtp the call doesn't go through, the automated attendant comes online to say that the extension is not available and then puts the call to voicemail. I read the Secure RTP wiki, I do see a similar entries in the dialplan under the extension name global, for both inbound and outbound: <condition field="${sip_has_crypto}" expression="^(AES_CM_128_HMAC_SHA1_32|AES_CM_128_HMAC_SHA1_80)$" break="never"> <action application="set" data="sip_secure_media=true"/> <!-- Offer SRTP on outbound legs if we have it on inbound. --> <action application="export" data="sip_secure_media=true"/> </condition> So if I can make the test call to 9664 on both phones, which I assume is using the inbound part by connecting the call. Any help in figuring this out would be greatly appreciated. BTW, I did buy the book, but there's no mention of SRTP/TLS in there. Thanks, Mitch