Actually, according to Dan York I'm an "audio snob." I'll take that. The implication is that I care about being heard clearly and well understood ;-)
Michael Graves mgraves mstvp.com o(713) 861-4005 c(713) 201-1262 sip:mjgra...@mstvp.onsip.com skype mjgraves > -------- Original Message -------- > Subject: Re: [Astlinux-users] Mobile SIP clients, Bria vs. Groundwire > From: Lonnie Abelbeck <li...@lonnie.abelbeck.com> > Date: Tue, November 27, 2012 4:02 pm > To: AstLinux Users Mailing List <astlinux-users@lists.sourceforge.net> > > > Hey Michael, > > That means a lot coming from the CODEC guru ! > > Here is a nice reference: > > https://developer.skype.com/resources/SILKDataSheet.pdf > > If only there was a SILK support backport for Asterisk 1.8 . > > Lonnie > > > On Nov 27, 2012, at 2:56 PM, <mgra...@mstvp.com> <mgra...@mstvp.com> wrote: > > > I'd expect SILK to outperform iLBC at similar bit rates. > > > > Michael Graves > > mgraves mstvp.com > > o(713) 861-4005 > > c(713) 201-1262 > > sip:mjgra...@mstvp.onsip.com > > skype mjgraves > > > >> -------- Original Message -------- > >> Subject: [Astlinux-users] Mobile SIP clients, Bria vs. Groundwire > >> From: Lonnie Abelbeck <li...@lonnie.abelbeck.com> > >> Date: Tue, November 27, 2012 1:25 pm > >> To: AstLinux Users Mailing List <astlinux-users@lists.sourceforge.net> > >> > >> > >> 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. ------------------------------------------------------------------------------ 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.
