[Asterisk-Users] chan_local environments: unexpected results

[John Todd]

I'm having some difficulty with chan_local dial requests.  It seems 
that when a chan_local call is picked up, that the native bridge 
"pops" the environment back to the settings of the original call. 
This is unexpected and leads to very frustrating results.   My 
example below is a very distilled sample of a much more complex 
dialplan problem I'm having with chan_local, but it illustrates the 
point.

In my example below, the variable MYTEST is set in the "original" 
call.  Then, the call is handed to chan_local at a different dialed 
number.  Then, as expected, a new environment is set up, and I cannot 
see the value I set for MYTEST in this new environment - so far,so 
goo.  I create another variable called OTHERTEST in this new 
environment.

However, as soon as the "Answer" application is called, I see the 
Local channel hangs up.   Suddenly, the environment of the call is 
handed back to the original call's settings!  This seems 
counter-intuitive, since my dial plan is following a path and 
expecting variable settings that may not be available in the original 
call's environment.  I would think that Local calls would be 
"sandboxed" such that they cannot see the environments from other 
calls, since that is how all the other channel types work...

Is this the expected behavior?


JT



Calls are handed from my SIP phone directly to [local].  The user at 
SIP extension 2209 is not registered, so the "Busy" (priority 105 in 
this case) routines will be called.

[local]
exten => 2213,1,SetVar(MYTEST=ishouldnotseethis)
exten => 2213,2,Dial(Local/2209 at local)

exten => 2209,1,SetVar(OTHERTEST=goodness)
exten => 2209,2,NoOp(${MYTEST})
exten => 2209,3,NoOp(${OTHERTEST})
exten => 2209,4,Dial(SIP/2209)
exten => 2209,105,Answer
exten => 2209,106,Playback(invalid)
exten => 2209,107,NoOp(${MYTEST})
exten => 2209,108,NoOp(${OTHERTEST})
exten => 2209,109,Hangup



ms1*CLI>
     -- Executing SetVar("SIP/2203-2496", "MYTEST=ishouldnotseethis") 
in new stack
     -- Executing Dial("SIP/2203-2496", "Local/2209 at local") in new stack
     -- Called 2209 at local
     -- Executing SetVar("Local/2209 at local-2af6,2", 
"OTHERTEST=goodness") in new stack
     -- Executing NoOp("Local/2209 at local-2af6,2", "") in new stack
     -- Executing NoOp("Local/2209 at local-2af6,2", "goodness") in new stack
     -- Executing Dial("Local/2209 at local-2af6,2", "SIP/2209") in new stack
   == Everyone is busy at this time
     -- Executing Answer("Local/2209 at local-2af6,2", "") in new stack
     -- Local/2209 at local-2af6,1 answered SIP/2203-2496
     -- Executing Playback("Local/2209 at local-2af6,2", "invalid") in new stack
     -- Playing 'invalid'
   == Spawn extension (local, 2213, 2) exited non-zero on 
'Local/2209 at local-2af6,2<ZOMBIE>'
ms1*CLI> [I hear the recording on my SIP phone at this point]
ms1*CLI>
     -- Executing NoOp("SIP/2203-2496", "ishouldnotseethis") in new stack
     -- Executing NoOp("SIP/2203-2496", "") in new stack
     -- Executing Hangup("SIP/2203-2496", "") in new stack
   == Spawn extension (local, 2209, 109) exited non-zero on 'SIP/2203-2496'
ms1*CLI>