I should add that the PAP2T I have is one that I got through Nextalarm.com which is customized to support alarm/security system monitoring over the internet (VoIP). The ATA is customized to connect one of the analog lines into their systems, the other line is available to configure for my own use (after you get the admin password from them). I mention this because it is possible that the customization included work to improve the A to D conversion process, not just hard wiring one of the lines to nextalarm's systems... https://nextalarm.com/do/customer/productDetail?id=17
David On Thu, May 27, 2010 at 9:28 AM, David Kerr <[email protected]> wrote: > The answer is "it depends." I have had success with a fax machine > connected to a linksys PAP2T ATA and routing through vitelity as the SIP > trunk provider (with Astlinux in-between). I have had complete failure with > an older Linksys/Sipura SPA-2002 and the same SIP trunk. > > I have both a PAP2T and SPA-2002 connected to my system and the audio > quality is noticeably better on the PAP2T. In particular there is a lot of > background hiss from the SPA-2002 that is not present on the PAP2T. That > may also suggest that the dynamic range of the SPA-2002 is not as strong as > the PAP2T. Both the background hiss and a compressed dynamic range would > explain why analog fax does not work well. > > In addition to good A to D conversion, which the PAP2T seems to handle > well, you then have to deal with the characteristics of SIP/VoIP. You may > have to fiddle with settings like jitter buffer and echo cancelling and you > want a high quality trunk provider. > > Good luck. > > David > > > On Thu, May 27, 2010 at 8:17 AM, Tom Chadwin < > [email protected]> wrote: > >> Slightly OT... >> >> With an uncustomized 0.7.2 (1.4) on a net5501 with a berofix PRI, what is >> the easiest way to attach an analogue fax which currently uses one DDI on >> the UK PRI? Will an ATA work? >> >> Thanks >> >> Tom >> >> >> >> ------------------------------------------------------------------------------ >> >> _______________________________________________ >> Astlinux-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/astlinux-users >> >> Donations to support AstLinux are graciously accepted via PayPal to >> [email protected]. >> > >
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