The usage of AMR codecs is mostly in the LTE space - which means that you're probably aiming to run a slightly higher scale than a single Asterisk server. Why not simply install Kamailio+rtpengine as your signalling media front-end and then relay everything back to Asterisk using a low-footprint codec, like alaw?
To me, that would sound like the proper solution in this case. Indeed, there is a minor technical up-hill - but it's worth the effort. Asterisk is a great codec linguistic, but when it comes to "pure transcoding" - Kamailio+rtpengine are far more capable. On Tue, Aug 18, 2020 at 2:31 PM Carsten Bock <cars...@ng-voice.com> wrote: > The comfort noise topic was not an issue, until someone got a Samsung S20 > in one of our VoLTE deployments.... ;-) > There are different types of comfort noise in AMR/AMR-WB and only newer > phones use the full scale of comfort noise there is. > > Thanks, > Carsten > -- > Carsten Bock I CTO & Founder > > ng-voice GmbH > > Trostbrücke 1 I 20457 Hamburg I Germany > T +49 40 524 75 93-40 | M +49 179 2021244 I www.ng-voice.com > > Registry Office at Local Court Hamburg, HRB 120189 > Managing Directors: Dr. David Bachmann, Carsten Bock > > > Am Di., 18. Aug. 2020 um 11:48 Uhr schrieb Michael Maier < > m1278...@mailbox.org>: > >> On 18.08.20 at 10:49 Carsten Bock wrote: >> > Hi, >> > >> > one of the big issues with AMR/AMR-WB and Asterisk is that usually >> devices >> > speaking AMR/AMR-WB do use quite a lot of comfort noise, which is not >> > supported by Asterisk as far as I know. Even if you use the patch from >> the >> > above link, you might end up with some distorted noise. >> >> Well, during my tests I in fact noticed some more or less silent >> distortions which may be caused by comfort noise generated by the mobile(?) >> (it's only from mobile -> local phone - >> not vice versa). For me it sounds like a pretty silent steam engine. >> >> I tested with amr and amr-wb in conjunction with transcoding (as I'm >> having no local phone supporting amr. Transcoding was between g722 or >> g711). Therefore I can't say for sure if >> this distortion is a result of transcoding or not. I could here it with >> two different mobiles (iPhone and Huawei). After muting of the iPhone, the >> distortion mostly went away (no >> change with the Huawei mobile). >> >> >> Thanks >> Michael >> >> -- >> _____________________________________________________________________ >> -- Bandwidth and Colocation Provided by http://www.api-digital.com -- >> >> asterisk-dev mailing list >> To UNSUBSCRIBE or update options visit: >> http://lists.digium.com/mailman/listinfo/asterisk-dev > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > asterisk-dev mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-dev
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