Hi Michael, As you know, iLBC supports both 20 ms and 30 ms packets, but Asterisk only advertises 30 ms via the SIP SDP. I have tried setting allow=ilbc:20 but the 20 seems to be ignored, I haven't looked at the source for more details.
Though if your SIP provider supports iLBC at 30 ms frames, things should work OK. Lonnie On Nov 27, 2012, at 2:00 PM, Michael Knill wrote: > 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. > > ------------------------------------------------------------------------------ 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.
