Hi,
You can always try AudioCodes media gateways.
They provide T.38 Passthrough among other things.
My company uses them for Fax Passthru, as well as for Dect Phones and PSTN
connections.
Different mixes are available.
Kerem
On Wed, Sep 9, 2009 at 4:39 AM, Tod Fitch <t...@fitchdesign.com> 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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--
Kerem Erciyes
Sistem Danismani
http://proje.keremerciyes.com
kerem.erci...@gmail.com
+90 532 737 05 83
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