On 12/02/2010 10:58 AM, Jeff LaCoursiere wrote: > But it seems to me that there should be a solution much like our "fax > relay", where we literally accept the fax call over the local LAN, produce > a PDF file, transfer it to the central switch which then dials it back out > over a T1. In that case the only "modem over VoIP" is on their local LAN, > which has performed well for us.
It can't be relayed; the alarm protocol is interactive, so a solution analogous to T.38 must be used. > I would love to see a DSP "modem" that could answer an asterisk channel, > send the data stream over TCP to some remote asterisk, which could then > "relay" the stream by making an outbound DSP modem call on a PSTN trunk. > Has anyone attempted anything like this? Guess what? There is already a standard for this, called V.150, Modem over IP. It certainly would be possible to implement this sort of thing for Asterisk, and some small steps in that direction have been taken way in the past... I'd suggest doing some Google searching to see what you can find. > So hoping this will spark some comments on the concept in general, and > really hoping someone has actually tackled something similar. It could > open up a nice niche for even residential customers with expensive POTS > lines dedicated to alarm systems. Or those customers could switch to cell-connected alarm panels (which are rapidly becoming less expensive and provide reliability benefits), or even IP-connected alarm panels. Either choice would be better in the long term than trying to convince an ancient alarm panel's modem to work over a packet network. -- Kevin P. Fleming Digium, Inc. | Director of Software Technologies 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA skype: kpfleming | jabber: [email protected] Check us out at www.digium.com & www.asterisk.org -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
