FYI, I think possibly I found a case where the OZ/PRI needs to change from PROGRESS to PROGRESS_MEDIA: http://pastebin.freeswitch.org/4628 In this case I'm getting two PROGRESS messages in a row. The raw Q931 messages are: [08 02 80 0c 03 1e 02 81 88] [08 02 80 0c 03 08 02 81 91 1e 02 81 88] The second progress msg includes: 08 02 81 91 which means: 08 = Cause IE 02 = two octets/bytes 81 = 1000 0001 = pvt network serving local user 91 = 1001 0001 = Cause number 17 = user busy I'm 99.9% sure that as soon as we get this PROGRESS info that we can act on it. MikeJ, is it possible that the result of the originate command can be something like -ERR BUSY instead of -ERR NORMAL_CLEARING? -MC P.S. - I think this case also shows that we don't need the warning message: 2008-06-16 19:58:22 [WARNING] zap_isdn.c:411 zap_isdn_931_34() Why bother changing state on 1:1 from PROGRESS to PROGRESS