| It was my understanding that T.38 only comes into play when the whole transmital is over IP. For instance analog gateway at originater is faxing to a fax machine at distant end which is also behind an analog gateway, and the path between them is pure IP. Once you bring a TDM path into place te T.38 protocol is not employed. Both ends have to agree on T.38.
What you said about echo is probably what is causing the problems. We have had problems with echo when terminating to pots lines, or from callers originating calls from POTs lines. Not all POTS lines induced echo. |