[Freeswitch-users] variable substitutions

[Brian May]

In the sample dialplan, I see the syntax ${...} and the syntax
$${...}. Are both these correct? Using eval suggests that the later
simply prefix the result with a dollar sign, I am not sure if this
intended...

examples - copied from random non-sequential lines in default.xml:

        <action application="set" data="ringback=${us-ring}"/>
        <action application="bridge"
data="user/${dialed_extension}@${domain_name}"/>

and for the $${...} syntax:

        <action application="set" data="transfer_ringback=$${hold_music}"/>
        <action application="set" data="ringback=$${uk-ring}"/>
        <action application="bridge" data="sofia/$${domain}/2000 at bkw.org"/>

Maybe both mean the same thing?
-- 
Brian May <brian at microcomaustralia.com.au>