Dear Jeff 1) The example below indeed shows PCMU. I have used this for debugging purposes. Sorry for not mentioning this. 2) Regarding the bandwidth - since the app calls over WiFi and not data, I think this should not be an issue. What do you think? Thx Remo On Wed, May 12, 2010 at 2:24 AM, Jeff Brower <jbrower at signalogic.com> wrote: > Remo- > > > The bad call quality on the 2G iPhone is a combination of static noise > (not > > too loud), 'robotic' speech and some short missing bits. > > > > I gathered some info provided by PJSIP, regarding a single call I made in > > case it's helpful: > > > > Call time: 00h:01m:16s > > 1st res in 3667 ms > > conn in 14909ms > > SRTP status: Not active > > Crypto-suite: (null)\n #0 PCMU @8KHz > > , sendrecv, > > RX pt=0 > > > > stat last update: 00h:00m:01.497s ago > > total 4.3Kpkt 698.8KB (873.6KB IP hdr) @avg=63.4Kbps/79.3Kbps > > *pkt loss=26 (0.6%)* > > discrd=0 (0.0%) > > dup=0 (0.0%) > > reord=0 (0.0%) (msec) min avg max last dev > > *loss period: 20.000 20.000 20.000 20.000 0.000* > > jitter : 0.000 4.626 194.625 24.125 5.505 > > TX pt=0 > > ptime=20ms > > One thing that seems to jump out is the call is not actually using G729, as > you had mentioned. Instead it's using > G711 uLaw. The aggregate bitrate (including IP/UDP/RTP headers) is almost > 80 kbps, which would be correct for 20 msec > G711. However, 80 kbps is too high for your 2G network max bandwidth, at > least according to the bandwidth figures you > gave previously. > > -Jeff > > > On Mon, May 10, 2010 at 4:09 PM, Jeff Brower <jbrower at signalogic.com> > wrote: > > > >> Remo- > >> > >> > My iPhone app uses the PJSIP iPhone Audio driver. > >> > It works well on 3G & 3GS iPhones, but I am having some voice quality > >> issues > >> > on 2G iPhones. > >> > When making a call with a 2G iPhone, the voice is distorted and it is > >> > impossible to have a conversation. > >> > > >> > Did anyone experince the same issue or has any advise? this can be > >> related > >> > to PJSIP/PJSIP audio driver or the 2G iPHone CPU. > >> > >> 2nd-gen iPhones don't have as much CPU horsepower, but that's probably > not > >> the whole issue. What does the distortion > >> sound like? Missing packets? Static? "Cyborg voice"? > >> > >> -Jeff > >> > >> > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20100512/37cafee6/attachment.html>
