[Freeswitch-users] CAMA Stack

[Steve Underwood]

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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