According to chapter 7 (Outside Connectivity) of the excellent "Asterisk: The Definitive Guide" (review version online at http://ofps.oreilly.com/titles/9780596517342/index.html), the following enables secure signaling and media paths:
exten => 1234,1,Set(CHANNEL(secure_bridge_signaling)=1) same => n,Set(CHANNEL(secure_bridge_media)=1) I would assume that setting these channel variables to 0 will disable secure media and signaling.
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