get full variable expression channelname
Description
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 dialplan 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)
Arguments
expressionrequiredchannelname
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