On Sun, Nov 27, 2016 at 8:07 AM, Jonathan H <lardconce...@gmail.com> wrote:
> Thanks, Max. > > Yes, of course, you are right, and I am an idiot because I was tired > and putting underscores before the variable name when I read it back! > Then I forgot to post the followup email to say I had figured it out. > > Now, this SHARED was not something I was aware of, but looked like an > ideal solution to passing variables BACK from to the parent channel. > > However, it does not seem to be very reliable. > > Code: > > [svtest1] > exten => s,1,Answer() > same => n,Verbose(1,Answered channel:${CHANNEL}) > same => n,Dial(Local/s@svtest2,,g) > same => n,Verbose(1,***In channel:${CHANNEL} sharedVar: > ${SHARED(sharedVar,Local/s@svtest2)} ) > same => n,Hangup() > > [svtest2] > exten => s,1,NoOp() > same => n,Set(SHARED(sharedVar,Local/s@svtest2)="I have been set > in svtest2") > same => n,Verbose(1,***In channel:${CHANNEL} sharedVar: > ${SHARED(sharedVar,Local/s@svtest2)}) > same => n,Answer() > same => n,Hangup() > There are a few problems with the way you are trying to use SHARED here. 1) Dial with the g option continues in the dialplan when the called channel hangs up and you are accessing a SHARED variable on the called channel while it is being destroyed. Thus it may or may not still exist when you attempt to access it. 2) You are using local channels. Remember local channels always come in pairs. The local channel name you are using to reference the SHARED variable is ambiguous. Not only do you not know which half of a local channel pair you will get, you may not even get one of the local channels the Dial created for this call if you have more than one of these calls happening in parallel. Executing this CLI command: CLI> originate local/s@svtest1 application echo Your dialplan creates this channel chain when Local/s@svtest2 executes the Answer: Echo() -- Local/s@svtest1-00000000;1 -- Local/s@svtest1-00000000;2 -- Local/s@svtest2-00000001;1 -- Local/s@svtest2-00000001;2 -- Answer() These problems can be avoided if we make a couple of changes. 1) Change which channel maintains the SHARED variables to the calling channel. 2) Pass the calling channel name to the called channel using variable inheritance. [svtest1] exten = s,1,NoOp() same = n,Answer() same = n,Set(__MY_CALLER=${CHANNEL(name)}) same = n,Dial(Local/s@svtest2,,g) same = n,NoOp(Returned SHARED(sharedVar) = '${SHARED(sharedVar)'} same = n,Hangup() [svtest2] exten = s,1,NoOp() exten = n,Set(SHARED(sharedVar,MY_CALLER)="I have been set in svtest2 by ${CHANNEL(name)}") exten = n,Answer() exten = n,Hangup() Richard
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