Darren Sessions wrote:
We used spandsp on the voip side. Our inbound vendor sets the call up G711 and spandsp answers. It's a bit slow as it seems to only negotiate v29 terbo, but it works.
Finding the correct version of libtiff was a pain. One sub version off, and it wouldn't work. Wasn't so much that it was a hard to get it to work, just a lot of tweaking to get it to work. Tedious.
It only supports V.29 (there is no terbo) ofor patent reasons. I have nearly finished V.17, but I'm unclear if the patent on its trellis coding has run out.
libtiff and timing slips are the two big issues, and there is little I can do. The recent libtiff security patches should fix most of the libtiff issues, I hope. Why so many people have timing problems has still to be resolved. Some have been misconfigured E1s/T1s, but there seem to be plenty of others. There is nothing I can do about that within spandsp.
spandsp on the VoIP side will always be a little flaky, I'm afraid. There is little I can do about that either. Building spandsp was actually a step towards T.38. That is why I have not been too interested in a HylaFAX interface (although one is in progress).
Regards, Steve
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