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@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@gmail.com <mailto:moises.silva@gmail.com>> wrote:
On Mon, Jan 23, 2012 at 5:36 PM, Michael Gende <mgende@gendesign.com <mailto:mgende@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.
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