Dial tone delay probability This topic has 0 replies, 1 voice, and was last updated 20 years, 2 months ago by Quan. Viewing 1 post (of 1 total) Author Posts 25th November 2002 at 12:07 #34853 QuanGuest Hi; For a PBX, How to calculate dial tone probability if given delay time. For instance, waht is probability with delay time 1 second. Appreciated for comments. Author Posts Viewing 1 post (of 1 total) The forum ‘Telecom Design’ is closed to new topics and replies.