asterisk users - Nov 2007 - accessing variables when using SIP vs. IAX

Hello,
 
I have some extensions that are using variables loaded by an AGI program.
Everything works fine and I am able to use NoOp to see the value of my
variables when using IAX, but the same variables don't work when using SIP.
I can provide further details, but right off of the bat does is there
something I need to know about the use of user defined variables in with SIP
channels vs. IAX channels?
 
Thanks,
 
Jason
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