The FAQ covers this.

http://wiki.freeswitch.org/wiki/FreeSwitch_FAQ#Q:_What_is_the_difference_between_using_a_.24.7Bvar.7D_and_.24.24.7Bvar.7D_in_the_configuration_files.3F

/b

On May 25, 2010, at 12:57 PM, Madovsky wrote:

Hi all,
 
should I us $${var} or ${var} to call a var from a dialplan set in a external sip profile ?
 
Thanks