Grepping the source didn't help.. The extension linked to below plays DTMF 8000310061 instead of a ringback. (an 800 number?) I'm trying to get spandsp_start_fax_detect working. I figured out by trial and error that it only works if I first answer the call. That there is no audio for the answered line is the likely problem. I tried pre_answer which fails to detect the fax. How do I play a ringback ? (Needs to stop if an extension answers. ) http:/xtronics.com/uploads/faxextension.txt -------------------------------------------------------------------------------- Karl Schmidt EMail Karl@xtronics.com Transtronics, Inc. WEB http://secure.transtronics.com 3209 West 9th Street Ph (785) 841-3089 Lawrence, KS 66049 FAX (785) 841-0434 The first panacea for a mismanaged nation is inflation of the currency; the second is war. Both bring a temporary prosperity; both bring permanent ruin. Ernest Hemingway --------------------------------------------------------------------------------