Just to further update this issue:
Three simple source code changes (testing-only at this point) resulted in zero detectable echo on all incoming and outgoing tdm pstn calls, even in the first second or two. I've not noticed any unusual side effects at all. Since the changes were only to chan_zap.c, I'll have to guess it will improve the historic x100p echo issues as well, and probably other zap channels also.
The changes were associated with the echo cancel routines, but as a non-programmer, I'm not sure what these changes really do (other than the end result).
If these changes prove to be successfull, then Mark is going to make them configurable options somewhere. Got'a love it.
I've just done the upgrade on my test asterisk system. On a series of outgoing PSTN calls via our TDM31B there was no detectable echo. We no longer need to use aggressive echo cancellation in the zaptel driver either - which is much nicer for our staff when they are making calls.
Thanks a bunch for fixing this.
Andrew
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