asterisk users - May 2006 - 911 @ Zap Channel Breakin

Ok here is one for you.

I know we all do the this for 911:

exten => _911,1,Dial(Zap/1/911)
exten => _9911,1,Dial(Zap/1/911)

And this probably is more then acceptable for most of us.  However I
have a system setup that uses SIP for most calls and 1 POTS line.  We
use a "least cost" routing that uses the POTS line for local calls AND
SIP when appropiate.  What I want to do is durring a 911 call test if
the Zap channel is Available (probably using ChanIsAvail() ) to test the
line.  IF the channel is in use I want to barge in with an announcment
saying that the line is needed for an emergency and the call we be
disconnected.  Then immediately drop the call capture the line so noone
else can use it, wait about 5 seconds for the telco to clear the far end
and place the 911 call.  Is this possible?

Thnaks
Mark C
n3whx@amsat.org
FWD: 293625

Mark Coccimiglio wrote:
> Ok here is one for you.
> 
> I know we all do the this for 911:
> 
> exten => _911,1,Dial(Zap/1/911)
> exten => _9911,1,Dial(Zap/1/911)
> 
> And this probably is more then acceptable for most of us.  However I
> have a system setup that uses SIP for most calls and 1 POTS line.  We
> use a "least cost" routing that uses the POTS line for local
calls AND
> SIP when appropiate.  What I want to do is durring a 911 call test if
> the Zap channel is Available (probably using ChanIsAvail() ) to test the
> line.  IF the channel is in use I want to barge in with an announcment
> saying that the line is needed for an emergency and the call we be
> disconnected.  Then immediately drop the call capture the line so noone
> else can use it, wait about 5 seconds for the telco to clear the far end
> and place the 911 call.  Is this possible?
> 
> Thnaks
> Mark C
> n3whx@amsat.org
> FWD: 293625
> 
> 
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I seem to recall a script that did something similar on voip-info.org.
Look through their E911 stuff, perhaps it's still there.

Good luck.

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On Sun, May 14, 2006 at 01:01:49PM -1000, Mark Coccimiglio wrote:
[...]
> disconnected.  Then immediately drop the call capture the line so noone
> else can use it, wait about 5 seconds for the telco to clear the far end
> and place the 911 call.  Is this possible?
How about this:

http://www.voip-info.org/wiki/view/Asterisk+tips+911

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