[asterisk-users] Channel variables "materializing" ...

[Julian Lyndon-Smith]

I am trying to track a strange bug down, and need to ask a really stupid 
question, just so I can eliminate the possibility ..

When a SIP channel is hung up, I import a variable called "MEETMEROOM" 
from the BRIDGEPEER channel, and if it is set, jump to another part of 
the dialplan.

[snip]
exten => h,1,ImportVar(PARKED=${BRIDGEPEER},MEETMEROOM)
exten => h,n,GotoIf($["${PARKED}" != ""]?end)
exten => h,n,goto(DialStatus,${DIALSTATUS},1)
exten => h,n(end),NoOp()
[snip]

There have been several occasions over the past couple of days where 
this variable has not executed the goto, and gone to the (end) label 
when I know for certain that the BRIDGEPEER channel does not have the 
variable set (I was able to duplicate the error once during a test phase 
when I was not setting the MEETMEROOM variable at all)

so, to the stupid question: If at some stage the BRIDGEPEER channel 
*has* had the MEETMEROOM variable declared, are there any circumstances 
at all where this variable may be transmitted to the next call that uses 
this channel.

There, I asked it. I don't believe that I just did. But there you have 
it. It's out in the open now ...

The only other thing that I was thinking of - if the PARKED variable was 
already set on the SIP channel, would an import of a non-existant 
variable from the BRIDGEPEER channel overwrite it, or keep it at the 
previous value ? Hmmm. Time to experiment.

Julian.

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