Hi Tod,
This is an older model of AudioCodes but you can find cheap in stock
somewhere maybe. I cheked and it is no longer listed on the site.
I use MP118/4FXS-4FXO regularly and apart from some asterisk based
configuration hacks needed to handle multiple users from the same IP these
devices are the way to go to offload G729 and G711 transcoding and keep
Asterisk hardware specs to a minimum.
Just FYI,
Kerem
MP-202B/2FXS/SIP-3 *MediaPack 202 VoIP Telephone Adapter, 2 FXS*
2 FXS lines, SIP, 1 WAN port, 1 LAN port, internal Router with Firewall,
G.711/723.1/726/727/729AB Vocoders
$104 $113
On Wed, Sep 9, 2009 at 5:20 PM, Josh Mahonin <jmaho...@cbnco.com> wrote:
> Hi Tod,
>
> I've used the PAP2T's myself, and I think some of them support T.38, and
> others do not. Linksys makes another ATA called the SPA-3102, which
> looks and acts pretty much identical to the PAP2T, but works with T.38.
> I've got a bunch of these in the field and they're rock-solid. I don't
> actually use the T.38 feature as much anymore, but it worked great when
> I needed it.
>
> To verify if your device supports T.38, you should see in the web
> interface, under 'Audio Configuration in Voice (advanced)' about 10
> different setttings for 'FAX', and specifically 'FAX Enable T38'. If
> this setting isn't there, your device doesn't support it.
>
> On a side note, when I was first experimenting with these, Asterisk T.38
> pass through wasn't in a pretty state, so I installed Callweaver, which
> does pass-through, as well as send/receive pretty well. Asterisk has
> probably caught up at this point, but I haven't had a reason to change
> yet. YMMV.
>
> Good luck,
>
> Josh
>
>
> Tod Fitch wrote:
> > I hope this is not too far off topic.
> >
> > Environment: Astlinux 0.6.2 (Asterisk 1.4.21.2) using a Linksys PAP2T
> > (firmware version 5.1.6(LS) which I think is the latest) to provide
> > service to a fax machine. (I know I should upgrade my Astlinux. And I
> > plan to once the 0.7 release comes along.)
> >
> > I am setup to use g711 in both the ATA and in Asterisk. All calls are
> > set for "no re-invite" so that all RTP streams go through the Astlinux
> > box and my older SIP ignorant dual WAN router only has to deal with
> > port mapping for the Asterisk box. Until recently faxes worked with
> > sufficient reliability that I considered this to be a solved problem.
> > But recently my VoIP provider put compression on the link they use
> > between the end point I connect to and the PSTN. Result: Faxes no
> > longer work.
> >
> > My VoIP provider claims that I can setup T.38 with them on that
> > number. From the literature it seems Asterisk 1.4.21.2 will perform T.
> > 38 pass through. But I am getting various results on looking up
> > whether or not the PAP2T properly supports T.38. I don't see attempts
> > by it to use T.38 in my SIP traces and at least one recent posting on
> > a discussion forum indicates that what T.38 is there is broken.
> >
> > So I am in the market for an ATA that properly supports T.38. The two
> > that have my attention at present are the Grandstream HT502 and a
> > Cisco ATA186.
> >
> > Cisco ATA186: It seems to be bulletproof and my office has used one on
> > a Cisco CallCenter setup to do faxes successfully for years (but I
> > don't know if that is using T.38 or not and it is probably not a SIP
> > provisioned device). But it is more expensive (minor nit) and my
> > experience setting up a Cisco PIX has led me to be wary of the ease of
> > setup issues. And, near as I can tell, you need to subscribe to a
> > contract with Cisco to get firmware updates.
> >
> > Grandstream HT502: Has router capability I don't need. Claims T.38
> > support. Price is right. But a number of web forum postings make we
> > wonder about hardware build quality and reliability.
> >
> > What are the experiences of others on this list regarding these (or
> > other) ATAs when used in an Asterisk SIP environment?
> >
> > Thanks for putting up with the slightly off topic post!
> >
> > --Tod
> >
> >
> >
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> >
>
>
>
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--
Kerem Erciyes
Sistem Danismani
http://proje.keremerciyes.com
kerem.erci...@gmail.com
+90 532 737 05 83
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