The definition in the document you cite is misleading: "The call setup delay, also known as the Post Dial Delay (PDD), in an ISDN-SS7 environment is the period that starts when an ISDN user dials the last digit of the called number and ends when the user receives the last bit of the Alerting message." There is noting wrong with this statement per se however you need to understand where it applies. "In an ISDN-SS7 environment" means an end to end ISDN. If the called party is not using DSS1 (Q.931 ISDN) the situation changes. As soon as you leave the ISDN the ALERTING message will now contain an indication that interworking was encountered and that inband call progress tones may be available. This ALERTING message must be ignored for our purposes and we must now listen to the inband tones to get the real "alerting" message; a ring back tone cadence. An end to end H.323 network can be considered an ISDN. -Vance On Wed, Oct 01, 2003 at 03:18:57PM +0200, Zygmuntowicz Michal wrote: } Found a nice doc on PDD: } http://www.ietf.org/proceedings/99nov/I-D/draft-ietf-sigtran-performance-req-01.txt } } --- } Zygmuntowicz Michal ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ List: Openh323gk-users@lists.sourceforge.net Archive: http://sourceforge.net/mailarchive/forum.php?forum_id=8549 Homepage: http://www.gnugk.org/
