[Freeswitch-users] CAMA Stack

Wed Jan 25 17:00:29 MSK 2012

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>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>> wrote:
> >
> >     On Mon, Jan 23, 2012 at 5:36 PM, Michael Gende
> >     <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/***
> >
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> >
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> >
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> >
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> >
> >
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