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<b>From</b>: "Jeff LaCoursiere" <jeff@sunfone.com><br />
<b>Sent</b>: Tuesday, September 25, 2012 11:40 AM<br />
<b>To</b>: asterisk-users@lists.digium.com<br />
<b>Subject</b>: Re: [asterisk-users] T.38 gateway ATA</span><br />
<br />
On 09/25/2012 10:34 AM, Sylvain Rochet wrote:<br />
> Hi Jeff,<br />
><br />
><br />
> On Tue, Sep 25, 2012 at 10:11:27AM -0500, Jeff LaCoursiere wrote:<br />
>> Aha! That is what I am looking for. What firmware rev are you<br />
>> using on the 3102?<br />
> 5.1.12 on SPA8000, 5.1.10(GW) on SPA3102, there is probably new releases<br />
> from Cisco, at the time I builded the T.38 network those were the latest<br />
> releases.<br />
><br />
> Here is my SPA3102 configuration that I changed or are relevant to FAX/T.38:<br />
><br />
> Network Jitter Level: very high<br />
> Jitter Buffer Adjustment: disable<br />
> Call Waiting Serv: no<br />
> Three Way Conf Serv: no<br />
> Echo Canc Enable: no<br />
> Echo Canc Adapt Enable: no<br />
> Echo Supp Enable: no<br />
> FAX CED Detect Enable: yes<br />
> FAX CNG Detect Enable: yes<br />
> FAX Passthru Codec: G711a<br />
> FAX Codec Symmetric: yes<br />
> FAX Passthru Method: NSE<br />
> DTMF Tx Mode: Normal<br />
> FAX Process NSE: yes<br />
> FAX Disable ECAN: yes<br />
> FAX Enable T38: yes<br />
> FAX Tone Detect Mode: caller or callee<br />
><br />
> Note that my Asterisk is also configured to do Fax Tone Detect and ask<br />
> my ATA to switch to T.38 before my ATA ask Asterisk to do so, thereforce<br />
> I don't know if ATA Fax Tone Detection work correctly.<br />
><br />
><br />
>> So if I am parsing you correctly, the asterisk server the ATA is<br />
>> registered to is *also* a T.38 gateway, as you have directly connected<br />
>> ISDN?<br />
> Yes, this is also a T.38 gateway, my goal was to use T.38 from my ATA to<br />
> Asterisk over my non-isochronous IP network. T.38 gateway is supported<br />
> since Asterisk >= 10 and you don't need it since you are doing T.38<br />
> passthru, but you need a device somewhere on the path able to detect the<br />
> FAX preamble and ask to switch the data channel from ulaw/alaw to T.38.<br />
><br />
><br />
> Sylvain<br />
><br />
<br />
Thanks for the info Sylvain, that is just what I was looking for. Hoping <br />
to find that a lower model has the same feature set (don't really need <br />
the FXO port)... I am playing with an SPA122 right now, which seems to <br />
have the same options available you mention above. I'll load the latest <br />
firmware and report my experiences for posterity.<br />
<br />
Cheers,<br />
<br />
j<br />
<br />
<br />
<br />
Jeff<br />
<br />
The Grandstream HT-701 (Single Port FXS ATA) is less than $30.00 from dstro. <br />
<br />
Working well right now. <br />
<br />
Bryant</span>