There is nothing wrong with sending T.38 in the initial invite, if the
call is from something that knows T.38 is usable at the very start of
the call. However, its best avoided, as so much equipment treats this as
an error condition.

Regards,
Steve

On 03/28/2017 07:34 PM, Yu Boot wrote:
> Recently updated to 1.6.15 and I've got similiar problem. Asterisk now
> rejects calls with T.38 in initial INVITE with "488 Not Acceptable
> Here" message. Fortunately, I can "delete" this wrong T.38 in SDP on a
> softswitch before FS.

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