[Freeswitch-users] CAMA Stack

Wed Jan 25 19:39:27 MSK 2012

Hi Michael,

I know about people using both Asterisk and FS for E911 because they 
used the TDD facility in spandsp, and I worked to improve aspects of the 
TDD receiver with a couple of them. There is supposed to be TDD code in 
Asterisk, but its completely useless. I have no idea what other elements 
have been used in these E911 systems. Some of them might have 
implemented CAMA themselves.

Regards,
Steve

On 01/25/2012 10:00 PM, Michael Gende wrote:
> Hey Steve,
>
> I know that Asterisk was used, we were once using it ourselves and had 
> Digium produce a CAMA stack (as you noted, no great shakes, I think 
> one guy did it in a weekend. It sure wasn't priced that way!). Do you 
> know of anyone else using FS for E911? I'd be interested to speak to 
> them.
>
> I happen to have test equipment that we used when testing our Digium 
> stuff, so that's no problem.  As a matter of fact, I'm also looking to 
> see if TDD has been adapted for FS. As I'm looking at solution 
> possibilities, I don't want to re-invent the wheel if someone else has 
> already been down this road.
>
> Thanks for responding,
>
> Mike G.
>
> On Tue, Jan 24, 2012 at 11:19 PM, Steve Underwood <steveu at coppice.org 
> <mailto:steveu at coppice.org>> wrote:
>
>     Hi,
>
>     Freeswitch and Asterisk (probably Yate and others too) have been used
>     for E911 services for some time, yet I haven't heard anyone ask
>     for CAMA
>     before. Its usually things like TDD for the deaf support they ask for.
>     However, it appears CAMA is a popular choice for E911, as it overcomes
>     limitations in the ISDN protocols for a service eager to know the
>     origins of a dropped call.
>
>     http://wholesale.att.com/reference_library/.../TR-73576.pdfseems to be
>     the relevant spec. Its basically a conventional Bell MF type T1,
>     with a
>     few modifications (or analogue pairs for smaller setups). It doesn't
>     look like a big job to implement it, although finding suitable
>     test beds
>     might be a pain.
>
>     Regards,
>     Steve
>
>     On 01/25/2012 03:19 AM, Michael Gende wrote:
>     > Yes, that's the one. Not the entire protocol, just the subset
>     used in
>     > E9-1-1 (while it still is).
>     >
>     > On Tue, Jan 24, 2012 at 10:31 AM, Moises Silva
>     <moises.silva at gmail.com <mailto:moises.silva at gmail.com>
>     > <mailto:moises.silva at gmail.com <mailto:moises.silva at gmail.com>>>
>     wrote:
>     >
>     >     On Mon, Jan 23, 2012 at 5:36 PM, Michael Gende
>     > <mgende at gendesign.com <mailto:mgende at gendesign.com>
>     <mailto:mgende at gendesign.com <mailto:mgende at gendesign.com>>> wrote:
>     >
>     >         I'm just starting a search on this subject, but does a stack
>     >         exist for FS implementing CAMA, or at least a subset of that
>     >         protocol?
>     >
>     >
>     >     Someone asked me about this a while ago, can't remember nor find
>     >     his name or email.
>     >
>     >     Just to confirm, are you talking about this?:
>     > http://en.wikipedia.org/wiki/Automatic_message_accounting
>     >
>     >     I don't think there is a stack or code to handle that in the
>     open
>     >     source community (though, you never know what is out there).
>     From
>     >     what I see requires MF tones, which at least spandsp is able to
>     >     generate and detect. Some logic is required on top to interpret
>     >     and respond to the tones accordingly.
>     >
>     >     *Moises Silva
>     >     **/Software Engineer, Development Manager/***
>     >
>     > msilva at sangoma.com <mailto:msilva at sangoma.com>
>     <mailto:msilva at sangoma.com <mailto:msilva at sangoma.com>>
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