Over at http://www.voip-info.org/wiki-Asterisk+tips+911, I see these extensions.conf lines:
exten => s,1,SetVar(SET_EMERG_FLAG=0) exten => s,n(checkavail),ChanIsAvail(${EMERGENCY_TRUNK}) exten => s,n,SetGlobalVar(EMERGENCY=1) exten => s,n,SetVar(SET_EMERG_FLAG=1) exten => s,n(dial),Dial(${EMERGENCY_TRUNK}/${EMERGENCY_NUM}) exten => s,s+2(trunkbusy),GotoIf($[${EMERGENCY} = 1]?inprogress)
Now, I have several questions:
* What is the "n" priority and how can they use it for several different items? Don't they need an increasing integer there?
n stands for the next available sequence after the previous one. This is used so that you can insert a step in the dial plan without having to renumber all the following steps.
* What is the "(checkavail)" doing?
Thats a label. If you use n, you lose the ability to say "goto 102"
* What does "s+2" mean?
ok. That's fooled me.
I've tried looking in docs and the wiki but can't figure it out.
Thanks!
-- John
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