[Asterisk-Dev] E911?

Alfred R. Nurnberger alfred at flosys.com
Sat Jan 17 13:49:36 MST 2004

911 centers use special lines to connect to the public network either
analog/T1 CAMA trunks or digital PRIs

I took a quick look at the new chan_zap.c from the CVS.
The implementation seems to be of the analog CAMA trunk kind.
CAMA trunks transmit the ANI (more or less Caller ID) as a formatted MF tone
string to the 911 equipment.
This way * is capable of being connected directly to a CAMA trunk into a 911
center providing ANI information.
Interesting application.


-----Original Message-----
From: asterisk-dev-admin at lists.digium.com
[mailto:asterisk-dev-admin at lists.digium.com]On Behalf Of Christopher
Sent: Saturday, January 17, 2004 10:29 AM
To: asterisk-dev at lists.digium.com
Subject: Re: [Asterisk-Dev] E911?

On Sat, 17 Jan 2004, Olle E. Johansson wrote:

>  From the CVS log:
> Modified Files:
> 	chan_zap.c
> Log Message:
>   Added functionality for E911 signalling
> What is E911 signalling?
It stands for "Ehanced 911" i belive it is the protocol for providing
the phones location to emergency services.

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