If you want to pass multiple arguments to an application, you
must specify it like this:

exten => 7,1,Sample,arg1&arg2&arg3&arg4

You may not embed commas in an argument.  I'm guessing that a good
way to do that, if you want, is to convert the comma to the URL
encoded form and use that, e.g. %xx in the string.

TODO: There probably needs to be some central code for parsing
multiple arguments in this fashion.

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