Da Voismart Knowledge Base.
Conditionally branches to priority + 101 with the right options set

  Optionally sets <varname> to the number of messages in that folder.  Assumes folder of INBOX if not specified.
  The option string may contain zero or the following character:
	'j' -- jump to priority n+101, if there is voicemail in the folder indicated.
  This application sets the following channel variable upon completion:
	HASVMSTATUS		The result of the voicemail check returned as a text string as follows
		<# of messages in the folder, 0 for NONE>

This application has been deprecated in favor of the VMCOUNT() function