In the archives, I have found discussion of detection of incoming distinctive ring patterns dating back almost 2 years, but I have not been able to figure out whether it is partially functional or even whether it is definitely planned. When I call Asterisk with a distinctive ring, it consistently logs the following: NOTICE[1217669936]: File chan_zap.c, Line 4421 (ss_thread): Got event (Ring/Answered)... However, looking at the code, it appears that this may just be a notice that Asterisk detected the callerid in spite of the distinctive ring. So, I'd be appreciative if anyone could comment on whether there is currently any way to detect incoming distinctive ring, or whether it is planned.