Remo- > 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? Ya over WiFi should be no problem. Suggest to check that "ptime" matches on both sides; i.e. both ends agree on 20 msec packet time (in many cases G711 is 10 msec). You may have to reconfigure and/or rebuild... I recall there's been some discussion about this on the pjsip list recently. -Jeff > 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 >> >> >> >> >> > >> >> >
