On 22/07/2011 5:43 AM, Israel Gottlieb wrote:
On Fri, Jul 22, 2011 at 12:39 AM, Kevin P. Fleming <[email protected] <mailto:[email protected]>> wrote:On 07/21/2011 04:34 PM, Joaquin Sosa wrote: On Mon, Jul 18, 2011 at 07:58, Steve Davies<[email protected] <mailto:[email protected]>> wrote: The magic sauce that you need is "T.38" - Asterisk 1.6 supports this to a limited degree, and your ITSP will need to support it. The sip.conf.sample file and the voip-info wiki has all the information you need to try it out. Correct. However it would be helpful to note T.38 support in Asterisk is broken. Take a T.38 ITSP, T.38 enabled Asterisk and T.38 ATA and try to send a fax. It won't work! We do this in our testing all the time, and it works fine. Since you didn't specify any particular version of Asterisk, there's no way to associate your "It won't work" statement with anything in particular. Given the variations of T.38 implementations that exist in ATAs, carrier networks and other places, *any* T.38 connection that involves implementations from more than one vendor is (unfortunately) likely to have problems, whether any version of Asterisk is involved or not well I tried a linksys spa 8000 and 2102 thru asterisk 1.8.3 1.8.4 1.6.2.16-19 sonus switch at itsp (012 israel) and no luck
Cisco released updated firmware earlier this year for the SPA8000 & SPA2102 which addresses T.38 problems.
I have an SPA8800 which I was able to use T.38 mode to send faxes successfully, I recently updated Asterisk box and also updated to 1.8.5, haven't tested the SPA8800 with this config but I am expecting it will still work. The key to my success was to ensure the SPA8800 did not do a re-invite to the ISP for the RTP stream.
Larry.
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