tag:blogger.com,1999:blog-5533715201051332198.post706629275572523337..comments2012-01-04T14:47:26.209-05:00Mark Lindseyhttp://www.blogger.com/profile/08995576111457955321noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-5533715201051332198.post-84225755362440202932011-09-30T08:30:34.554-04:002011-09-30T08:30:34.554-04:00Mark- Did you ever get an answer to this question? I think I know what may be happening. Perhaps the number before the # is a VM pilot number? The D code would be consistent with the DTMF standard which includes a fourth column of A,B,C, and D keys -- but not F. (These tones were used on Operator stations and old Autovon phones.) These tones are still used today in VM systems which are integrated using inband DTMF instead of SDMI. The tones would be transmitted immediately after the VM system answers to indicate what mailbox to put the call into. So, in this instance (5176#0B600) the 5176 number would likely be the VM system, and -- in keeping with common practice, B would appear to indicate that a call was being forwarded on Busy from extension 600.John Bhttp://www.blogger.com/profile/11381231559182831462noreply@blogger.com