Hi all! I have a strange problem when using asterisk. I have configured asterisk to receive calls (FX0). In my configuration, I want asterisk to play music while I record the caller's speech. If the caller does the call from a fixed line telephone, there is no problem, but in case the caller does the call from a mobile GSM phone, the quality of the music he hears becomes so bad, and even more when he speaks. I have tried several codecs. Any idea or advice? thanks in advance, -esteban-
---- Original Message ---- From: "Esteban Maestre" <emaestre@iua.upf.es> To: <asterisk-users@lists.digium.com> Sent: Friday, November 25, 2005 11:22 AM Subject: [Asterisk-Users] sound problem, please help!> Hi all! > > I have a strange problem when using asterisk. I have configured > asterisk to receive calls (FX0). In my configuration, I want asterisk > to play music while I record the caller's speech.Dialup-karaoke? :-) Leif
Hi, I have noticed that most mobile phones (GSM and CDMA at least) seem to have a tendency to interrupt the incoming audio stream when the microphone levels get louder than a certain threshold (such as when you are speaking into it). I do not know exactly why this happens, nor whether it is something that happens in the handset (the handset mutes the incoming audio, which doesn't make much sense) or in the network (maybe to try to save bandwidth?). Also, the GSM codec is intended to intelligibly encode human speech, not general audio signals such as music. GSM uses approximately 6-8 times less bandwidth than G.711u/a, and the degradation in the quality of music and other non-speech signals is one of the tradeoffs that we make in order to not have the cost of mobile calls increase 6-8 times over. Maybe if Europe was as backward with its mobile systems as the United States currently is, you could try to get your users to call your system from analog mobile phones... They don't use digital compression (by definition, I suppose) and would probably work much better for your specific application ;). -Rusty On 11/25/05, Esteban Maestre <emaestre@iua.upf.es> wrote:> > Hi all! > > I have a strange problem when using asterisk. I have configured asterisk > to receive calls (FX0). In my configuration, I want asterisk to play music > while I record the caller's speech. If the caller does the call from a > fixed line telephone, there is no problem, but in case the caller does the > call from a mobile GSM phone, the quality of the music he hears becomes so > bad, and even more when he speaks. > I have tried several codecs. > Any idea or advice? > > thanks in advance, > > -esteban- > > _______________________________________________ > --Bandwidth and Colocation sponsored by Easynews.com -- > > Asterisk-Users mailing list > Asterisk-Users@lists.digium.com > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >-------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20051128/d8532a51/attachment.htm
Hello, Rusty! Thanks for your reply... You have been the only one ;) Hahaha, it could become dangerous... ;) Well, I have been investigating it a little bit, and I guess the main reason is something related to what you have pointed in the first paragraph. I've found some interesting information here: http://www.privateline.com/PCS/GSM08.html There is an interesting article I've already tried to post, but toy can find it easily in the www above. regards, -esteban-> I don't think you'd want to hear most of what I say when I am on hold, > especially if I am on hold with a telephone company! It tends to be > somewhat > on the profane side. *grin* > > -Rusty > > On 11/25/05, Esteban Maestre <emaestre@iua.upf.es> wrote: >> >> kind of... ;) >> I want to know what the people say when they are waiting... :P >> >> do you have any idea on what the problem could be? >> >> -esteban- >> >> >> > ---- Original Message ---- >> > From: "Esteban Maestre" <emaestre@iua.upf.es> >> > To: <asterisk-users@lists.digium.com> >> > Sent: Friday, November 25, 2005 11:22 AM >> > Subject: [Asterisk-Users] sound problem, please help! >> > >> >> Hi all! >> >> >> >> I have a strange problem when using asterisk. I have configured >> >> asterisk to receive calls (FX0). In my configuration, I want asterisk >> >> to play music while I record the caller's speech. >> > >> > Dialup-karaoke? :-) >> > >> > Leif >> > >> > >> > >> > >> >> >> _______________________________________________ >> --Bandwidth and Colocation sponsored by Easynews.com -- >> >> Asterisk-Users mailing list >> Asterisk-Users@lists.digium.com >> http://lists.digium.com/mailman/listinfo/asterisk-users >> To UNSUBSCRIBE or update options visit: >> http://lists.digium.com/mailman/listinfo/asterisk-users >> >