Brad- > I am experiencing 1-2 seconds of initial jitter when I make > a on a 3g connection. > > My application is an iPhone application using pjsip 1.0.3 > compiled in conjunction with iPhone OS3.1.2. > > The initial jitter is only heard by the recipient I am > calling from the iPhone application. After the 1-2 seconds > the jitter clears up and the call sounds just fine. > > I have tried decreasing the codecs quality setting in > order to drop the bandwidth intensity as well as using the > jitter prefetch buffer. Both have had no effect. > > Was hoping that trying one of the more recent versions of > pjsip might yield better results. At the moment I can get > pjsip 1.5.5 to compile and connect calls on the iPhone, > but can't get the audio to work. > > If anyone has some insight on the what might fix the > initial 1-2 second jitter lag or getting pjsip 1.5.5 audio > to work on the iphone please feel free to reply. I don't know about pjsip, but one general suggestion would be to look for "adjustable" or "dynamic" jitter buffer settings. If enabled then the buffer size might auto-adjust until it becomes deep enough that underruns are not occurring frequently. There may be a way to disable this, or force a specific jitter buffer depth, say 3-5 packets (assuming 10 msec packets). I.e. so it always starts that way and doesn't adjust on its own. This is just a guess. Like I say, I don't know whether pjsip supports a dynamic jitter buffer. -Jeff
