Lonnie I guess there is always G.729 which is not optimal but low bandwidth. Also interested in the AMR Codec http://sourceforge.net/projects/asterisk-amr/files/. PS. Can you set iLBC to 20ms in sip.conf? Would that actually fix the problem? Think I need to do some more testing.
Regards Michael Knill On 28/11/2012, at 6:25 AM, Lonnie Abelbeck wrote: > Greetings, > > I have been testing mobile SIP client access to AstLinux, and the combo of > SIP TLS, plus SRTP encryption, using either Bria or Groundwire works well for > both incoming and outgoing calls. Possibly others have additional comments... > > Bria iPhone Edition > http://www.counterpath.com/bria-iphone-edition.html > > Groundwire, Business Caliber SIP for the iPhone > http://www.acrobits.cz/11/acrobits-groundwire-for-iphone > > Either work quite well on my iPod Touch 4th gen. I'm not the first to > mention this here on this list, thanks to others, you know who you are. :-) > > Groundwire has a lot more features than Bria, but I personally find that > Bria's voice quality is noticeably better than Groundwire's voice quality, > which is still OK. If you require Groundwire's features, go with it, if the > simpler Bria suits your needs, go with Bria. Your milage may vary. > > The key feature of both Bria and Groundwire, using iOS at least, is support > of a power efficient background TCP process for handling incoming calls, not > requiring the power hungry technique of the whole application running in the > background. Groundwire also supports push notifications for incoming calls, > but this requires Groundwire to upload your SIP credentials to their server, > something I'm not willing to do, particularly when SIP/TLS works so well. > > CODEC's > > My standard setting is using G.711 CODEC, over WiFi, either via a public AP > or using a Verizon LTE MiFi. This works the best for me, but not the most > efficient. > > I tried using the iLBC CODEC, with mixed results. The common issues with 30 > ms iLBC packet length in Asterisk vs 20 ms for G.711 and transcoding. > > iLBC (30ms packet) to G711 (20ms) ULAW transcoding sounds "robotic" > https://issues.asterisk.org/jira/browse/ASTERISK-18094 > > normally using the iLBC CODEC it sounds 'pretty good', though noticeable > artifacts compared to G.711 . Additionally when placing callers on hold, > etc. I see (Asterisk 1.8)... > -- many of these -- > Nov 27 12:09:06 gw-lan local0.warn asterisk[4679]: WARNING[18388]: > translate.c:206 in framein: no samples for ilbctolin > -- > -- and these -- > Nov 27 12:09:20 gw-lan local0.warn asterisk[4679]: WARNING[18388]: > translate.c:225 in framein: ilbctolin did not update samples 0 > Nov 27 12:09:20 gw-lan local0.warn asterisk[4679]: WARNING[18388]: > codec_ilbc.c:104 in ilbctolin_framein: Huh? An ilbc frame that isn't a > multiple of 50 bytes long from RTP (60)? > -- > > Are there other tricks getting iLBC to transcode between 30 and 20 ms > properly ? Possibly later Asterisk versions than 1.8 ? > > Possibly down the road, when Asterisk 11 is production quality, is the > (Skype) SILK CODEC the solution ? > > Asterisk 10 Codecs and Audio Formats > https://wiki.asterisk.org/wiki/display/AST/Asterisk+10+Codecs+and+Audio+Formats > > Notice the "codec_silk.so" is provided as a binary by Digium for free, I'm > not sure we could automatically provide it in the AstLinux image for the same > reason Digium doesn't. > > Does the lower bitrate SILK CODEC provide the best solution vs iLBC ? Bria > currently supports both a NB and WB SILK CODEC. > > Comments? > > Lonnie > > > ------------------------------------------------------------------------------ > Keep yourself connected to Go Parallel: > DESIGN Expert tips on starting your parallel project right. > http://goparallel.sourceforge.net > _______________________________________________ > Astlinux-users mailing list > Astlinux-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/astlinux-users > > Donations to support AstLinux are graciously accepted via PayPal to > pay...@krisk.org. ------------------------------------------------------------------------------ Keep yourself connected to Go Parallel: DESIGN Expert tips on starting your parallel project right. http://goparallel.sourceforge.net _______________________________________________ Astlinux-users mailing list Astlinux-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/astlinux-users Donations to support AstLinux are graciously accepted via PayPal to pay...@krisk.org.
