Hi > 1. After Wellgate sends SETUP message it normally receives Call > Proceeding, next Alerting and GW starts to locally generate > ring-tone. This should be OK if we have no internetworking with > PSTN. When we have mapping of 2 different protocols there arise > issuses like no ring tone or no announcemnets or fake alerting > (like in my case with ooh323). To cope with this the ISDN switch > or intermediate GW must send to originating party a H323 > Information Element (IE) called Progress-Indicator which tells > the originating party to wait for the messages (alerting, busy, > "The number you have dialed is no longer in service...", etc.) > in-band instead of generating them locally. > More info on this can be found here: > http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186 > a0080094c33.shtml
Does your question is ooh323c should check Progress-Indicator? or Did you mean ooh323c to generate ALERTING message with Q.931 Progress Indicator Element? I guess, ALERTING means ringtone stage, There is no fake ringtone/Alerting. Or you can says fake, if other end phone ringer is not working ;) Here: GnuGK <------- [ ooh323c - asterisk core - SANGOMA FXO(PSTN interface)] <---- PSTN So in Asterisk internal dealing (PSTN to H.323 conversion): Sangoma indicates to Asterisk Core (ringing). Asterisk Core generates ALERTING event for ooh323c, ooh323c sents ALERTING to GnuGK. Do you want PI bit here? > 2. I think currently ooh323 doesn't support "early media", i.e > doesn't open the RTP channel after receiving alerting and doesn't > support faststart in messages before CONNECT. In this way if I > put the PI=8 in H.323 Alerting message I don't hear alerting tone > because the channel is not opened from Asterisk side and the > signalling messages can't pass-through. > I think these features are very important for H323 channel > because most of the time we deal with PSTN networks, either for > terminating or originating and no fake signalling is acceptable. > > Hope to have answered some of the questions from the other users. > I will appreciate if someone help me in coding these. I think it > is not too much work! > What you mean by "faststart in messages before CONNECT". ooh323c supports faststart. And faststart can get performed before CONNECT message. If you want to do more than fast start by saying early media. Than you have to play with non-established channels. Regards, Avin Patel Objective Systems, Inc. > -----Original Message----- > From: xx xx [mailto:[EMAIL PROTECTED] > Sent: Monday, June 05, 2006 4:51 PM > To: ooh323c-devel@lists.sourceforge.net > Subject: [ooh323c-devel] ooh323 q931 signalling problem > > > Hi all, > I have playing around to find what is the problem with the "fake > alerting" and ooh323 channel. I made a test with GnuGK (2.2.2), > Asterisk 1.2.7.1, ooh323 from asterisk-addons-1.2.3. The config > is following: > > Wellgate FXS GW <------>GNUGK <---------> ASTERISK > (ooh323)+SANGOMA FXO<-----------> PSTN > > So, what I have found: > 1. After Wellgate sends SETUP message it normally receives Call > Proceeding, next Alerting and GW starts to locally generate > ring-tone. This should be OK if we have no internetworking with > PSTN. When we have mapping of 2 different protocols there arise > issuses like no ring tone or no announcemnets or fake alerting > (like in my case with ooh323). To cope with this the ISDN switch > or intermediate GW must send to originating party a H323 > Information Element (IE) called Progress-Indicator which tells > the originating party to wait for the messages (alerting, busy, > "The number you have dialed is no longer in service...", etc.) > in-band instead of generating them locally. > More info on this can be found here: > http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186 > a0080094c33.shtml > > So, I think the ooh323 must send PI=8 in Alerting message(means: > In-band information or an appropriate pattern is now available) > and opens RTP channel to wait for in-band signalling messages > from the PSTN. This should fix the fake ringing and the real > alerting tone should be heard once the PSTN rings. > I found this OK with SIP. > > 2. I think currently ooh323 doesn't support "early media", i.e > doesn't open the RTP channel after receiving alerting and doesn't > support faststart in messages before CONNECT. In this way if I > put the PI=8 in H.323 Alerting message I don't hear alerting tone > because the channel is not opened from Asterisk side and the > signalling messages can't pass-through. > I think these features are very important for H323 channel > because most of the time we deal with PSTN networks, either for > terminating or originating and no fake signalling is acceptable. > > Hope to have answered some of the questions from the other users. > I will appreciate if someone help me in coding these. I think it > is not too much work! > > > Thanks! > mortex > > ----------------------------------------------------------------- > http://www.sportni.bg/worldcup/ - Германия 2006 - Световното първе > нство по футбол наближава! > > > _______________________________________________ > ooh323c-devel mailing list > ooh323c-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/ooh323c-devel > _______________________________________________ ooh323c-devel mailing list ooh323c-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ooh323c-devel
