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@coppice.org <mailto: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> > <mailto: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> <mailto: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. > > *Moises Silva > **/Software Engineer, Development Manager/*** > > msilva@sangoma.com <mailto:msilva@sangoma.com> <mailto:msilva@sangoma.com <mailto:msilva@sangoma.com>> > > Sangoma Technologies > > 100 Renfrew Drive, Suite 100, Markham, ON L3R 9R6 Canada > > > > > t. +1 800 388 2475 <tel:%2B1%20800%20388%202475> <tel:%2B1%20800%20388%202475> (N. America) > > t. +1 905 474 1990 x128 <tel:%2B1%20905%20474%201990%20x128> <tel:%2B1%20905%20474%201990%20x128> > > f. +1 905 474 9223 <tel:%2B1%20905%20474%209223> <tel:%2B1%20905%20474%209223> > > > > ** > <http://www.sangoma.com/contact?utm_source=signature&utm_medium=email&utm_cam... <http://www.sangoma.com/contact?utm_source=signature&utm_medium=email&utm_campaign=email+signatures>> > > Products > <http://sangoma.com/products?utm_source=signature&utm_medium=email&utm_campai... <http://sangoma.com/products?utm_source=signature&utm_medium=email&utm_campaign=email%2Bsignatures>> | > Solutions > <http://sangoma.com/solutions?utm_source=signature&utm_medium=email&utm_campa... <http://sangoma.com/solutions?utm_source=signature&utm_medium=email&utm_campaign=email%2Bsignatures>> | > Events > <http://sangoma.com/about_us/events?utm_source=signature&utm_medium=email&utm... <http://sangoma.com/about_us/events?utm_source=signature&utm_medium=email&utm_campaign=email%2Bsignatures>> | > Contact > <http://www.sangoma.com/contact?utm_source=signature&utm_medium=email&utm_cam... <http://www.sangoma.com/contact?utm_source=signature&utm_medium=email&utm_campaign=email%2Bsignatures>> | > Wiki > <http://wiki.sangoma.com/?utm_source=signature&utm_medium=email&utm_campaign=... <http://wiki.sangoma.com/?utm_source=signature&utm_medium=email&utm_campaign=email%2Bsignatures>> | > Facebook > <http://www.facebook.com/pages/Sangoma-VoIP-Cards/43578453335?utm_source=sign... <http://www.facebook.com/pages/Sangoma-VoIP-Cards/43578453335?utm_source=signature&utm_medium=email&utm_campaign=email%2Bsignatures>> | > Twitter > <http://www.twitter.com/sangoma?utm_source=signature&utm_medium=email&utm_cam... <http://www.twitter.com/sangoma?utm_source=signature&utm_medium=email&utm_campaign=email%2Bsignatures>>`| > | YouTube > <http://www.youtube.com/sangomatechnologies?utm_source=signature&utm_medium=e... <http://www.youtube.com/sangomatechnologies?utm_source=signature&utm_medium=email&utm_campaign=email%2Bsignatures>> > > > > _________________________________________________________________________ > Professional FreeSWITCH Consulting Services: > consulting@freeswitch.org <mailto:consulting@freeswitch.org> <mailto:consulting@freeswitch.org <mailto:consulting@freeswitch.org>> > http://www.freeswitchsolutions.com > > FreeSWITCH-powered IP PBX: The CudaTel Communication Server > http://www.cudatel.com > > Official FreeSWITCH Sites > http://www.freeswitch.org > http://wiki.freeswitch.org > http://www.cluecon.com > > FreeSWITCH-users mailing list > FreeSWITCH-users@lists.freeswitch.org <mailto:FreeSWITCH-users@lists.freeswitch.org> > <mailto:FreeSWITCH-users@lists.freeswitch.org <mailto:FreeSWITCH-users@lists.freeswitch.org>> > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users > http://www.freeswitch.org > > > > _________________________________________________________________________ > Professional FreeSWITCH Consulting Services: > consulting@freeswitch.org <mailto:consulting@freeswitch.org> > http://www.freeswitchsolutions.com > > FreeSWITCH-powered IP PBX: The CudaTel Communication Server > http://www.cudatel.com > > Official FreeSWITCH Sites > http://www.freeswitch.org > http://wiki.freeswitch.org > http://www.cluecon.com > > FreeSWITCH-users mailing list > FreeSWITCH-users@lists.freeswitch.org <mailto:FreeSWITCH-users@lists.freeswitch.org> > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users > http://www.freeswitch.org
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