We have whatever the latest beta version of Asterisk is installed, H323 (latest version) with T.38 and SpanDSP (v. 0.0.2 311??) - and are trying to transmit fax over SIP or H323. Have no interest in receiving faxes, just broadcasting tiff files to fax machines.
On both H323 and SIP when calling the receiving fax machine (calling both windows fax client and conventional fax machine), the fax answers, but on our end it keeps ringing… After a minute or so the call is terminated from the server and the fax (using winfax) says "reception error).
We have once sent a fax that was received but simply came across as a black page, although that was the only one that was ever received…
We don’t have any additional hardware, and once this is setup it will have a direct connection to a 20MB line, so bandwidth isn’t an issue.
The only other issue is that we are testing with two gateways, one is SIP which is all fine compatibility wise, but the other isn’t sure if thier carrier can pass on H323 traffic - apparentley this can be confirmed and activated on Monday if required.
I’m purely looking for suggestions, as I know not many people have had any luck with this… Maybe you can think of something we haven’t tried???
Oh, if you can help this is kind of urgent! Will gladly share info with you when it works!