Hi, sorry for the missunderstanding, this should work fine so hope you find the issues. BR/Olle _____ From: pjsip-bounces@xxxxxxxxxxxxxxx [mailto:pjsip-bounces at lists.pjsip.org] On Behalf Of Mukesh Sharma Sent: den 13 maj 2010 11:52 To: pjsip list Subject: Re: Voice Distorted on 2G iPhones Hi BR/Olle, quality on gprs/edge is not good is obvious. what I have told is about iphone 2g over wifi. Regards Mukesh On 13-May-2010, at 2:06 PM, Olle Frimanson wrote: Hi Mukesh, I think you should abandon the idea of using 2G for VoIP calls. We have done significant testing on 2G networks and in principle is the best effort QoS that GPRS/Edge provide just not good enough. Sometimes it works but very often you will have high PL. First is the delay very unpredictable from low 300 ms to high 2-3s sometimes, secondly as mentions you must calculate that GPRS can some times go down to just 8 kbit/s. This is why the PoC (Push to Talk standard) in IMS uses AMR with 8, 20 ms, voice frames / packet. If you can cope with the extra delay I think you should consider using a low bit rate codec and send multiple frames/Packet, like ptime=80 or 160 ms. BR/Olle _____ From: pjsip-bounces@xxxxxxxxxxxxxxx [mailto:pjsip-bounces at lists.pjsip.org] On Behalf Of Mukesh Sharma Sent: den 13 maj 2010 07:33 To: pjsip list Subject: Re: Voice Distorted on 2G iPhones hi, on 2g I have observed two problem one is latency issue and another is some time voice quality is very bad. For latency issues i have increased latency and for other audio related problems i have wrote audio files for iphone and simulator. You can check these files in spokn/lib github repository in pjsipcompilation folder . File names are pa_mac_core_iphone.c and pa_mac_core_iphonesimulator.c . I have use speex codec and not used G729 . You can check out spokn from appstore to check the audio quality in 2G. Regards Mukesh On 12-May-2010, at 6:35 PM, Re Mo wrote: That's great, thank you, I will dive into the code. Can you provide some details on how you resolved these issues? On Wed, May 12, 2010 at 3:50 PM, Mukesh Sharma <mukesh.s at geodesic.com> wrote: hi, we have sorted out 2g Distorted voice issue. u can checkout code on spokn on git hub. pjsip compilation and changes is in this folder lib/pjsipcompilation. u can check spokn which is available on app store. Regards Mukesh On 12-May-2010, at 5:29 PM, Re Mo wrote: 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 >> >> > _______________________________________________ Visit our blog: http://blog.pjsip.org <http://blog.pjsip.org/> pjsip mailing list pjsip at lists.pjsip.org http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org Regards, Mukesh Sharma Head - Principal Technologist | Spokn Geodesic Limited | www.geodesic.com <http://www.geodesic.com/> Tel: +91 22 40315859 Mobile: +919892029162 _______________________________________________ Visit our blog: http://blog.pjsip.org <http://blog.pjsip.org/> pjsip mailing list pjsip at lists.pjsip.org http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org _______________________________________________ Visit our blog: http://blog.pjsip.org pjsip mailing list pjsip at lists.pjsip.org http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org Regards, Mukesh Sharma Head - Principal Technologist | Spokn Geodesic Limited | www.geodesic.com <http://www.geodesic.com/> Tel: +91 22 40315859 Mobile: +919892029162 _______________________________________________ Visit our blog: http://blog.pjsip.org pjsip mailing list pjsip at lists.pjsip.org http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org Regards, Mukesh Sharma Head - Principal Technologist | Spokn Geodesic Limited | www.geodesic.com <http://www.geodesic.com/> Tel: +91 22 40315859 Mobile: +919892029162 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20100515/da40078c/attachment-0001.html>
