get full variable expression channelname
Evaluates the given expression against the channel specified by channelname, or the current channel if channelname is not provided.
Unlike GET VARIABLE, the expression is processed in a manner similar to dialplanThe core call-routing configuration of Asterisk, written mostly in extensions.conf as contexts, extensions, and priorities that decide how every call is handled. Full definition → evaluation, allowing complex and built-in variables to be accessed, e.g. The time is ${EPOCH}
Returns 0 if no channel matching channelname exists, 1 otherwise.
Example return code: 200 result=1 (The time is 1578493800)
expressionrequiredchannelname
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